Judged not physically possible

No prize. They are wild birds, creatures and not a technology.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A sealed shell for a few travellers is the bare cabin; the prize of the trip lies with the gun that hurls it.

Who is paid. Whoever runs the gun would buy it, assumed here to be a launch firm, and existing spacecraft builders could all make something so simple.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A working ship that carries people and cargo between worlds is the base of a whole transport industry.

Who is paid. Carriers and other firms working in space buy ships, and since a second yard could build the same craft the established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. As described it is a walking aid for those who work on small rocks, a niche; gravity for whole ships and stations is judged under the plates.

Who is paid. Mining firms buy the belts for their workers, and a small worn device can be made by many workshops, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. It is a drifting heap of wrecks gathered by nature, not a product anyone makes or sells.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Travel faster than light would open other stars to trade and settlement, a transport industry of its own; it is a change for those who go, not for most people.

Who is paid. Ship operators pay for the drive, and once a firm had built it others could too, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. An engine that moves ships faster or more cheaply would change the cost of all space transport.

Who is paid. An engine is bought by whoever runs the ship, assumed here to be carriers, and established engine builders could copy it once it worked.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A lift from the ground to orbit would slash the cost of reaching space for every firm that uses it.

Who is paid. Shippers pay to send cargo up, and since another line could be built once the first was shown to work, the gain is assumed to go to the large builders and the holders of the few good ground sites.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Holding air in place without walls would make settling airless worlds far cheaper than building domes.

Who is paid. Settlements are public works a government pays for, and once the field was known other builders could copy it, so established settlement builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Real weight underfoot on any ship or station would be fitted almost everywhere people live in space.

Who is paid. Ship and station operators buy it, and once the plates worked other makers could copy them, so established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. An engine that moves ships faster or more cheaply would change the cost of all space transport.

Who is paid. An engine is bought by whoever runs the ship, assumed here to be carriers, and established engine builders could copy it once it worked.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Boots for walking on a giant planet's storm serve only the few who would work there, a niche.

Who is paid. Mining firms buy them for their crews, and they are assumed to be simple footwear that any workshop could make.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A beam that pulls distant objects in would change towing, docking and cargo handling in space and perhaps on the ground.

Who is paid. Ship and port operators buy it, and once shown to work others could build it, so established equipment makers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Pushing rocks and other hazards away keeps a ship safe, but it is a safety fitting of the craft and not an industry of its own.

Who is paid. Ship operators pay for it within the craft, and once the field worked other shipbuilders could copy it, so established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Holding air in place without walls would make settling airless worlds far cheaper than building domes.

Who is paid. Settlements are public works a government pays for, and once the field was known other builders could copy it, so established settlement builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Heavy shoes that keep a worker planted where things weigh little are a niche aid for a few crews.

Who is paid. Space operators buy it for their crews, and unlike plain weighted shoes it needs a dense material no workshop has, so the established makers of space gear supply it, though any of them could copy it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A field that both shields a ship from debris and gathers fuel as it flies would cut the cost of every voyage.

Who is paid. Ship operators pay, and once the field worked other shipbuilders could copy it, so established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Holding air in place without walls would make settling airless worlds far cheaper than building domes.

Who is paid. Settlements are public works a government pays for, and once the field was known other builders could copy it, so established settlement builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. An engine that moves ships faster or more cheaply would change the cost of all space transport.

Who is paid. An engine is bought by whoever runs the ship, assumed here to be carriers, and established engine builders could copy it once it worked.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. It is a creature found in space, not bred or built by anyone, so it is not a product.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Pushing rocks and other hazards away keeps a ship safe, but it is a safety fitting of the craft and not an industry of its own.

Who is paid. Ship operators pay for it within the craft, and once the field worked other shipbuilders could copy it, so established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Real weight underfoot without spinning the ship would be fitted almost everywhere people live in space.

Who is paid. Ship and station operators buy it, and once it worked other makers could copy it, so established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A marker in space for navigators is a minor aid to navigation.

Who is paid. A beacon serves all ships and none can be charged, so a government pays, and a simple transmitter or light is something many firms could build.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A place to land, park or refuel is a necessary part of space traffic but only an extra beside the ships and launch works.

Who is paid. Ship operators pay to use it, and it is easy to copy, so those who already hold the port sites collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It helps a crew find their way or see what lies about them, a useful fitting but only a part of the ship.

Who is paid. Ship operators pay for it within the craft, and the firms that already make ship instruments supply it since the design can be copied.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A ship that crosses between stars in an instant is the base of a transport industry, the size settled for faster-than-light travel elsewhere.

Who is paid. Carriers and other firms working in space buy ships, and since a second yard could build the same craft the established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Working out a safe course between stars is essential to such travel but is an instrument within the ship.

Who is paid. Ship operators buy it as part of the craft, and the established makers of flight instruments supply it since it can be copied.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Fixed landmarks make faster-than-light travel safer, but a beacon is an aid to traffic and not an industry.

Who is paid. No passing ship can be charged for a beacon, so a government pays, and the firms that already build such aids supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Crossing between stars without the long journey would open a transport industry of its own, the size settled for faster-than-light travel elsewhere.

Who is paid. An engine is bought by whoever runs the ship, assumed here to be carriers, and being strange does not stop established engine builders copying it once it worked.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A giant ship that carries whole fleets between stars would be the backbone of trade between worlds.

Who is paid. Carriers and other firms working in space buy ships, and since a second yard could build the same craft the established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A vessel that outruns light would found a transport industry between the stars, however it is steered.

Who is paid. Carriers and expedition firms buy ships, and many yards could build them once shown how, so established vehicle builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Switching weight off on the ground would let factories make things that today can only be made in orbit, and is judged as other control of gravity is.

Who is paid. Manufacturers buy the room, and once it worked other makers could copy it, so established equipment builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. A band around a star with far more room than any planet would add living room for a large share of humanity.

Who is paid. No private buyer could fund a world, so a government pays and the large builders that already hold public works contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. It adds to knowledge of the sky but yields nothing to sell, so its worth is limited to science.

Who is paid. Nobody could be charged for what it learns, so a government pays the instrument and probe builders that already hold such contracts.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. An engine with almost limitless thrust would change the cost of all travel between worlds.

Who is paid. Ship operators pay, and once a firm had shown how to catch and hold such a black hole others could do the same, so established engine builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Travel faster than light would open other stars to trade and settlement, a transport industry of its own; it is a change for those who go, not for most people.

Who is paid. Ship operators pay for the drive, and once a firm had built it others could too, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A pocket alarm for passing ships is a gadget for the few travellers who want a ride.

Who is paid. The description names a traveller carrying it, so ordinary people are assumed to buy it, and it is pocket electronics that many firms could make.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. This is only the trigger for a crash protector, a safety part within a ship.

Who is paid. Ship operators pay for it within the craft, assumed here, and shipbuilders could all fit such a simple trigger.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. The description names no use for it, so I took it as the story shows it, a stray machine that takes over its owner's life, which is a hazard and not a product.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. One machine that holds and handles everything known would change how most people learn, decide and work.

Who is paid. I assume a single machine serving everyone would be built as a public work, so a government pays, and the firms that already build large computing works for governments collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. A model of everything that exists could answer any question about the world, which would change how most things are discovered and decided.

Who is paid. I assume a single machine of that size would be built as a public work, so a government pays, and the firms that already build large computing works for governments collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A sure verdict on whether two people suit each other for life would be wanted before almost every marriage.

Who is paid. Couples pay for a reading, and I assume that once one such machine was shown to be right others could build their own, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. A machine that thinks and speaks straight into the mind, which I assume could be made in numbers, could do much of the mental work people do now.

Who is paid. Firms would pay to put it to work, and once one had been built others could learn to build their own, so I assume the firms that already own costly computing plant and sell to every business collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. A machine that truly thinks, judged as if the sorcery worked, could do much of the mental work people do now, which would change how most people work.

Who is paid. Firms would pay to put it to work, and once one had been built others could learn to build their own, so I assume the firms that already own costly computing plant and sell to every business collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Talking across the stars with no delay would be the backbone of trade and rule between worlds, judged as if it worked, though it serves only those who live or work out there.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming people live across vast distances, printed messages that cross them at once would be the backbone of trade and rule, an industry of its own.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Talking across the stars with no delay would be the backbone of trade and rule between worlds, judged as if it worked, though it serves only those who live or work out there.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Talking across the stars with no delay would be the backbone of trade and rule between worlds, judged as if it worked, though it serves only those who live or work out there.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Sending messages straight from mind to mind over long range, judged as if it worked, would be a new kind of phone service worth an industry.

Who is paid. I assume ordinary people would pay for it like a phone, and once one sender had been built others could copy it, so the firms that already own the networks collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Talking across the stars with no delay would be the backbone of trade and rule between worlds, judged as if it worked, though it serves only those who live or work out there.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming people live around many stars, instant messages between them would be the backbone of all trade and rule across space, an industry of its own.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming people live around many stars, instant messages between them would be the backbone of all trade and rule across space, an industry of its own.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Assuming it only records a world's history and does not foretell it, a chronicle that keeps itself up to date is a reference work for the curious.

Who is paid. Assuming readers buy copies, there is only this chronicle and only its keepers can write it, so they keep what readers pay.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is a creature's nature or a state of mind, not something made and sold.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. One great spire for calling beyond the solar system is a single act of curiosity with no customers waiting for the service.

Who is paid. I assume a state would pay for it as a science project, as nobody could be charged for its use, and the big builders that already win such works would be paid.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Talking across the stars with no delay would be the backbone of trade and rule between worlds, judged as if it worked, though it serves only those who live or work out there.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is contact with a strange being that happens to people, not a device anyone could make and sell.

Who is paid. Nothing is made or sold.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming people live around many stars, instant messages between them would be the backbone of all trade and rule across space, an industry of its own.

Who is paid. Assuming it needs great stations and not a pocket set, firms and governments with far-flung operations pay for the traffic, others could build the device once it is known to work, and the carriers whose networks feed the stations collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Knowing the day of your death would upend life insurance and how people plan their lives.

Who is paid. People would pay for a reading, and in the story only the inventor knows how the machine works, so he keeps what is left for as long as the secret holds.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Clearing drunkenness in a moment is a convenience for drinkers and those who deal with them.

Who is paid. I assumed drinkers and bars buy it; unlike a sobering pill this is a device others could copy, so established makers of such equipment collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Regrowing lost or ruined tissue would change what hospitals can do for the badly injured.

Who is paid. I assumed hospitals buy and run it; once it worked other makers could copy it, so established medical equipment firms and hospitals collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Easier births would be welcome, but this is a side use of a gravity machine and other aids to birth already exist.

Who is paid. I assumed hospitals buy it; whoever makes gravity machines for other uses could supply it, so those firms and the hospitals collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. It is done to a person without their say, to hurt them, break their mind or override their will or body, which no one may lawfully buy or use.

Who is paid. Assuming it is outlawed for everyone, governments and employers included, nothing is sold.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. It only matters where minds can be read, and then it guards privacy much as a lock does.

Who is paid. I assume the barrier is a made or taught thing, which the description does not say; people who fear being read would buy it and many could supply it, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Swaying a whole population at once would be worth a great deal to any ruler who wanted it.

Who is paid. A government would pay, and once the device existed the firms that already build broadcasting and security gear could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. It only matters where minds can be seized, and then it guards a person much as a lock does.

Who is paid. People who fear being read would buy it for themselves, assuming it is sold openly, and it is simple enough for many makers to copy, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. It is the act of using a born gift, not something made or taught that could be sold.

Who is paid. Nothing is made or sold here, so there is no buyer and no seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It only matters where minds can be read, and then it guards privacy much as a lock does.

Who is paid. People who fear being read would buy it for themselves, assuming it is sold openly, and it is simple enough for many makers to copy, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Telephones already carry words between distant people, so sending thoughts instead is a convenience.

Who is paid. People would buy it for themselves, and once it existed many makers could copy it, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is a person born with a gift, not a thing that can be made and sold.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Hiding your thoughts matters only where mind-readers exist, so it is a niche.

Who is paid. I assumed people who fear being read buy it for themselves, and a jamming gadget is easy to copy, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. It is a born ability of a person, not something made or taught that could be sold.

Who is paid. Nothing is made or sold here, so there is no buyer and no seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It only matters where minds can be read, and then it guards privacy much as a lock does.

Who is paid. People who fear being read would buy it for themselves, assuming it is sold openly, and it is simple enough for many makers to copy, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Shaping what every household believes would be worth a great deal to a ruler.

Who is paid. No household would choose this for itself, so I assume the state requires it and pays or makes owners pay; the breeders already set up to supply and service it would collect since it could be bred by others.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is a being with a gift, not a thing that can be made and sold.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. It is a born gift of a person, not something made or taught that could be sold.

Who is paid. Nothing is made or sold here, so there is no buyer and no seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Sending minds out to faraway planets would open exploration and trade in what they find.

Who is paid. I assume exploring firms would buy the machine; it could be copied, and it works only with gifted minds, so the gain goes to those rare operators as pay and not to any seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A voice that compels obedience works only on those within hearing, so it controls a few people at a time.

Who is paid. I assume a state would pay to train its agents in it, and though it is a technique its usual suppliers and schools would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Telephones already carry words between people, so sending thoughts instead is a convenience.

Who is paid. People would buy it for themselves, and once it existed many makers could copy it, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Instant calls across the galaxy would be worth an industry of its own wherever people are spread among the stars, which ordinary telephones could not serve.

Who is paid. Callers would pay for each call; the description does not say the organism comes from a single source, so I assumed it can be bred like other living tools here, and the carriers that already run call networks would keep the stock and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is a sorcerous family custom, not a thing that can be made and sold.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. A kept copy of a living mind answers the most basic wish of all, not to be lost at death.

Who is paid. I assume the copy can be woken or restored, which the description does not say. People would pay whatever they could to keep a copy of themselves, and since the method could be copied the firms that already hold the stores, bodies and clinics would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. It is done to a person without their say, to hurt them, break their mind or override their will or body, which no one may lawfully buy or use.

Who is paid. Assuming it is outlawed for everyone, governments and employers included, nothing is sold.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Sending a mind between the stars is travel for those with somewhere far to go, not the saving of a life, so it is an industry and not a need of most people.

Who is paid. Travellers would pay for the passage, and whoever already owns the transmitters and the waiting bodies at each end would collect, since the sending could be copied.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work.

Who is paid. Traders and carriers pay, since the description sends objects and not people, which is why the payer differs from the booths for travellers; once a firm had built it others could, so the carriers and builders that already own the depots and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work; this one sends people too.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a firm had built it others could, so the carriers and builders that already own the depots, the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as a working way to travel and signal faster than light, it would found an industry of its own, though few people would ever make the trip.

Who is paid. Carriers and shipping firms buy the ships, as they do in the other star drive entries, and once the drive is known others could build it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work.

Who is paid. Traders and carriers pay, since the description sends objects and not people, which is why the payer differs from the booths for travellers; once a firm had built it others could, so the carriers and builders that already own the depots and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work.

Who is paid. Traders and carriers pay, since the description sends objects and not people, which is why the payer differs from the booths for travellers; once a firm had built it others could, so the carriers and builders that already own the depots and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work; this one reaches other planets and sends people too.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a firm had built it others could, so the carriers and builders that already own the depots, the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A ship that crosses the cosmos would found an industry of its own, and I have not counted the travel through time, whose worth I cannot judge.

Who is paid. I assume governments would pay for and closely hold a craft that can also move through time, and the established space contractors that build for them collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work.

Who is paid. Traders and carriers pay, since the description sends objects and not people, which is why the payer differs from the booths for travellers; once a firm had built it others could, so the carriers and builders that already own the depots and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching other stars in a useful time would found an industry of its own, though few people would ever make the trip.

Who is paid. Carriers and shipping firms buy the ships, as they do in the other star drive entries, and once the drive is known others could build it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching other stars in a useful time would found an industry of its own, though few people would ever make the trip.

Who is paid. Carriers and shipping firms buy the ships, as they do in the other star drive entries, and once the drive is known others could build it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling gravity would make lifting and moving heavy things far cheaper, which changes the costs of transport and building rather than meeting a basic need.

Who is paid. Firms that move and lift things buy it, and once it is built others could copy it, so the vehicle and aircraft makers that already own factories and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling gravity would make lifting and moving heavy things far cheaper, which changes the costs of transport and building rather than meeting a basic need.

Who is paid. Firms that move and lift things buy it, and once it is built others could copy it, so the vehicle and aircraft makers that already own factories and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Travel between stars faster than light would open trade and settlement on other worlds, which is an industry of its own.

Who is paid. I assume shipping lines and settlers pay, and once a ship of this kind flies others could be built, so the shipbuilders and carriers that already own yards, ports and fleets collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Instant travel between any places would change where most people live and work and replace nearly all other transport.

Who is paid. The carriers that run the network buy the machines and charge travellers for each trip, and since nothing described stops a second builder, the firms that already own sites, power and travellers' custom collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. I assume the distant places are other worlds, as in the story and the other gate entries, and cheap instant passage between worlds would open new land and trade to a large share of humanity.

Who is paid. I assume carriers and traders pay to send people and goods through, which is why the payer differs from the booths for travellers within a world, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A cleared place to arrive safely is useful only if people can teleport, and then it is a plain piece of floor.

Who is paid. Owners of buildings and public places provide it, and anyone can mark out a clear space, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged only as a lift, it moves people between floors as lifts already do; control of gravity itself would be worth far more.

Who is paid. Building owners buy it, and the firms that already fit and service lifts collect because the machine itself is easy to copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Sending things instantly across any distance would replace most shipping and haulage, which changes how most people are supplied and how most firms work; this one sends people too.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a firm had built it others could, so the carriers and builders that already own the depots, the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Cheap instant passage between worlds would open new land and trade to a large share of humanity; I assume the relay post holds the machine that passes travellers on, so it is judged as the gate and not as a building.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Cheap instant passage between worlds would open new land and trade to a large share of humanity.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A seat lifted by trained birds is a novelty ride for a few people.

Who is paid. Riders pay for it, and anyone who can train the birds could offer it, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. I assume passage through the gate is cheap and open to all as in the like entries, and instant passage between worlds would open new land and trade to a large share of humanity.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Cheap instant passage between worlds would open new land and trade to a large share of humanity.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Shaping the air round a flying vehicle gives a smoother, quieter flight, which is a feature.

Who is paid. Airlines and other operators pay for it through the aircraft, and the established aircraft builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Instant travel from place to place would end most journeys by road, rail and air and change where most people live and work.

Who is paid. The carriers that run the network buy the machines and charge travellers for each trip, and since nothing described stops a second builder, the firms that already own sites, power and travellers' custom collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Instant travel from place to place would end most journeys by road, rail and air and change where most people live and work.

Who is paid. The carriers that run the network buy the machines and charge travellers for each trip, and since nothing described stops a second builder, the firms that already own sites, power and travellers' custom collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Instant travel between any places would change where most people live and work and replace nearly all other transport.

Who is paid. The carriers that run the network buy the machines and charge travellers for each trip, and since nothing described stops a second builder, the firms that already own sites, power and travellers' custom collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. I assume the ships that use these natural shortcuts are what is sold, and reaching other stars would found an industry of its own, though few would make the trip.

Who is paid. Carriers and shipping firms buy the ships, as they do in the other star drive entries, and once the drive is known others could build it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A fixed route between stars is a feature of space in the story and not something built or sold.

Who is paid. Nothing is sold, so there is no buyer and no seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. The description gives a hovering car held to flat ground and names no cancelling of gravity, so I judge it with the cushion craft as a niche beside the ordinary car.

Who is paid. Owners buy it for themselves, and many builders can make a craft that hovers low over flat ground, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Free personal flight with no limit stated would be an industry of its own, replacing many trips now made by car.

Who is paid. Riders buy it for themselves, and a light craft like this could be built by many workshops once the trick is known, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Instant travel from place to place would end most journeys by road, rail and air and change where most people live and work.

Who is paid. The carriers that run the network buy the machines and charge travellers for each trip, and since nothing described stops a second builder, the firms that already own sites, power and travellers' custom collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A vast prize. Cheap instant passage between worlds would open new land and trade to a large share of humanity.

Who is paid. I assume carriers and traders pay to send people and goods through, and once a gate is built others could build more, so the large builders and carriers that already own the ports and the customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A flying carpet that carries its rider wherever they please, working as promised, would be an industry of its own as the motorbike is; the description gives no limit on range or weather, so I assume there is no such limit.

Who is paid. Riders buy it for themselves, and a light craft like this could be built by many workshops once the trick is known, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Putting a whole city on wheels gains its people little beyond the power to move on, at great cost.

Who is paid. I assume the city itself pays, and the large engineering firms that already build for cities collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A hall where captured towns are broken up is a place in the story and not a thing anyone would buy.

Who is paid. Nothing is sold, so there is no buyer and no seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it existed, the element is what makes sunlight panels work, and electricity straight from sunlight would change what power costs.

Who is paid. Panel makers buy it, and because the element is rare, which is the difference from ordinary panels, whoever holds the supply keeps what is left.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, a field that stops a runaway reaction is a safety device for the few sites that run nuclear plants.

Who is paid. Plant owners buy it, assuming it guards power plants and is not a defence against bombs, and a method this strange would be very hard for others to copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it existed, a mined rock that holds raw energy would be a fuel worth an industry of its own.

Who is paid. Fuel users buy it, assumed here to be firms, and whoever holds the few asteroid deposits controls a supply others cannot get.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, power drawn from background noise would need no fuel at all, which would change what electricity costs.

Who is paid. Power firms buy it, assuming it yields power at the scale of a plant and not a trickle, and a method this strange would be very hard for others to copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, a lamp that floats where it is wanted is a nicer light, which is a convenience.

Who is paid. People buy them for homes, and in the story they are everyday goods that many makers supply, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a new way to make electricity from light would change what power costs.

Who is paid. Power companies buy the plants, and a method this strange would be very hard for others to copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A strong metal lighter than any other would cut the weight and running cost of aircraft, ships and vehicles.

Who is paid. Vehicle and building firms buy it, and a metal recipe gets copied, so the established metal makers with furnaces and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A substance that cannot be seen at all would be prized for hiding soldiers, craft and equipment.

Who is paid. Governments pay, assuming hiding is its main use, and the firms that already hold military supply contracts make it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A stable light structural alloy would cut the weight and running cost of aircraft, ships and structures.

Who is paid. Vehicle and building firms buy it, and a metal recipe gets copied, so the established metal makers with furnaces and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A material nothing can pierce would be worth an industry in armour, vaults, vessels and containment.

Who is paid. Builders of vehicles and strongrooms buy it, and nothing in the description stops a second maker: a thing being hard to cut open and study does not keep others from learning to make it, so the established materials firms collect as they do with the tough alloys.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Taken at its promise, a mineral that transforms industry would change costs across it, though the description does not say how.

Who is paid. Industry buys the ore, and whoever owns the deposits holds something others cannot get, assuming it is found in only a few places.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Removing all friction from a chosen surface would cut wear and wasted energy in machines everywhere.

Who is paid. Machine owners buy it, assuming it is a tool and not a weapon, and once one firm builds it established equipment makers copy and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A substance nothing can pierce or destroy would be worth an industry in armour, vaults, vessels and containment.

Who is paid. Builders of vehicles and strongrooms buy it, and nothing in the description stops a second maker: a thing being hard to cut open and study does not keep others from learning to make it, so the established materials firms collect as they do with the tough alloys.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A crystal that freezes all the water it touches is a hazard to the whole world, not a product.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A clear coating that is perfectly slick and cannot be pierced would cut wear and protect surfaces across industry, which is more than an ordinary finish.

Who is paid. Manufacturers buy it, and being impenetrable does not stop a second maker, so the big materials firms collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A lens of oil held by a field is a specialist part for instruments.

Who is paid. Instrument makers buy it, and once such fields exist any optics firm could make one, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A ship's shell that almost nothing can break would be worth an industry to anyone who travels or hauls in space.

Who is paid. Ship owners buy it, and though the story has a single firm selling it, nothing in the description stops a second maker, since a shell being hard to cut open and study does not keep others from learning to make it; I assumed the method gets out, so established shipbuilders and materials firms collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A window that shows a lovely scene from long ago is a luxury for homes and offices.

Who is paid. People buy panes for their homes, and the glass must sit for years in front of a fine view, so those who own such land collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. An extremely hard material would change cutting tools, bearings and wearing parts across industry.

Who is paid. Toolmakers and manufacturers buy it, and nothing in the description stops a second maker, so the big materials firms collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A material of almost impossible strength would let far larger structures be built and change heavy construction.

Who is paid. Builders buy it, and great strength alone does not stop a second maker, so the big materials firms collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Unlike the make-anything machines this makes materials and not finished goods, so turning common stuff into any scarce material changes costs across the industries that use materials without changing how most people live.

Who is paid. Manufacturers and miners buy the process, and since it is a method and not a machine that can copy itself, I assumed it spreads once shown and the firms with plants and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a shell that passes through any barrier leaves no armour or shelter able to protect, a wider use than a weapon made only against buried shelters.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a beam that makes steel crumble would leave steel ships, vehicles and guns useless, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, and assuming a soldier carries it, a beam that shoves or strikes does much the same job as a gun.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that surely stops a person at a distance without harming them does what no gun can, and police and guards everywhere would carry it in place of firearms.

Who is paid. Police forces and armies buy it with public money, and since rival makers could copy it once it was shown, the suppliers that already hold their contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a field that hides whole ships or bases from sight would change how forces are found and struck, far more than clothing that hides one soldier.

Who is paid. Assuming it is bought to hide forces in war, governments pay, and assuming rivals learn to copy it the established arms suppliers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a field that hides whole ships or bases from watchers would change how forces are found and struck.

Who is paid. Assuming it is bought to hide forces in war, governments pay, and assuming rivals learn to copy it the established arms suppliers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops blows and fire around each soldier would change how armies are protected.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Assuming a soldier carries it, it does much the same job as a gun, so the gain over a gun is modest.

Who is paid. Armies buy it with public money, and since rival makers can copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, a beam that aims a weapon perfectly is an aiming aid fitted to guns, and guided weapons already come close.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, and assuming a soldier carries it, a beam that chills its target does much the same job as a gun.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a weapon that destroys whatever it strikes leaves no armour, wall or hull able to protect, which would change how wars are fought.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, and assuming a soldier carries it, a beam that shoves or strikes does much the same job as a gun.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how soldiers, ships and cities are defended, even when it guards one wearer.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, a blade of light loses to a gun as a weapon, so it is a prized object for a few buyers.

Who is paid. As with other blades, a few people buy one for themselves, and assuming others can copy it once one is built, no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a beam that makes steel crumble would leave steel ships, vehicles and guns useless, which is more than a handheld beam that only kills.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Carried in the hand, it does much the same job as a gun, so the gain over a gun is modest.

Who is paid. Armies buy it with public money, and since rival makers can copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Judged as if it worked, and assuming a world that runs on atomic power, a device that shuts all of it down nearby would disarm an enemy at a stroke.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier of force that halts anyone entering it would change how borders, bases and prisons are guarded.

Who is paid. Assuming it is bought to guard public ground, governments pay, and assuming rivals learn to copy it the established suppliers with standing contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. An explosive of enormous power, which rival powers in the story fight to own, is worth a great deal to a state as a threat.

Who is paid. Only governments pay for it, and as with nuclear arms only the handful of builders a state allows near such a weapon may make it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Assuming it is a stronger blasting explosive, it is a modest gain for mining and building.

Who is paid. Mines and builders buy it, and many chemical firms can make an explosive, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if the creature existed, a ritual blade made from its tooth is a prized object for a few buyers.

Who is paid. People buy one for themselves, and assuming the teeth are hard to come by, whoever can get them controls the supply.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, and assuming a soldier carries it, a staff that chills its target does much the same job as a gun.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A gun built to get past personal shields matters only where such shields exist and is otherwise one more variation on a soldier's weapon.

Who is paid. Armies pay, and such guns are easy to copy, so the arms makers that already hold supply contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Munitions that steer themselves onto a target make each shot count and are a mainstay of what modern armies buy.

Who is paid. Armies pay, and since many engineering firms can build guidance, the missile and ammunition makers that already hold supply contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A machine built for single secret killings serves only a few covert services, which makes it a niche.

Who is paid. Secret services pay, and it is a small variant of machines the existing arms and robot makers already build, so they collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a device that destroys whatever it is turned on leaves no armour, wall or hull able to protect, and can dig as well.

Who is paid. Assuming it is a weapon first, since the description gives digging as an occasional use, armies buy it, and assuming rival makers learn to copy it the established arms suppliers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A blade that can be adjusted is a curiosity for a few buyers, since a sword loses to a gun.

Who is paid. As with other blades, a few people buy one for themselves, and assuming others can copy it once one is built, no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming a station the size of a moon could be built, it would be the largest single arms order a state could place.

Who is paid. One government pays for a single station, and the few yards already able to build large spacecraft would share the work.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, a barrier that stops attacks would change how ships, bases and cities are defended.

Who is paid. Assuming it is bought for defence in war, governments pay, and assuming rivals learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Judged as if it worked, an energy sword loses to a gun as a weapon, so it is a prized object for a few buyers.

Who is paid. A few people buy one for themselves, and assuming others can learn to copy it once one is built, no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Assuming the mining tool is one that destroys rock outright, a weapon made from it would leave no armour or wall able to protect.

Who is paid. Armies buy it with public money, and assuming rival makers learn to copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. In the story no one at all is allowed to use weapons that reach back through time, so even if they worked nobody could buy one.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Assuming a soldier carries it, it does much the same job as a gun, so the gain over a gun is modest.

Who is paid. Armies buy it with public money, and since rival makers can copy it the established arms suppliers with standing army contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Knowing of serious crimes before they happen would change policing altogether, if the forecasts were right as the story promises.

Who is paid. The state pays and keeps the seers itself; what is bought is the recording equipment, which the firms already supplying police could make.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reading the thoughts of whole crowds would give a state a power worth an industry, though only a state would use it.

Who is paid. The state pays for a single great machine, and I assume its usual defence suppliers build it and could be replaced by others.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as if it worked, one tablet that feeds a person for weeks would be an industry of its own and would change how armies, travellers and the hungry are fed, though I assumed most people would still eat ordinary meals for pleasure.

Who is paid. Households buy it, and I assumed the recipe can be copied once it is known, so the food and pharmacy brands with shop space collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. This is a natural growth in a story, not a technology, and nobody makes or sells it.

Who is paid. Nothing is sold, so nobody pays and no seller gains.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Swimming in a floating ball of water is a thrill for visitors, not a need.

Who is paid. I assumed resorts and pleasure grounds buy it to draw visitors, and once gravity could be controlled at all, many firms could build such a pool.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Lights that float in the air are decoration.

Who is paid. Home owners buy them, and once floating gadgets can be made at all, many makers could build a lamp.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A hovering seat is a luxury piece of furniture, whatever the hovering device might be worth elsewhere.

Who is paid. Households buy it, and I assumed the hovering part can be copied, so any furniture maker could sell it and none keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A lamp that hovers where it is put is a handy light, whatever the hovering device might be worth elsewhere.

Who is paid. Households buy it, and I assumed the hovering part can be copied, so any lamp maker could sell it and none keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Seats that drift about a bar are a novelty for drinkers.

Who is paid. Bars buy them to draw custom, and once floating furniture can be made at all, many makers could build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A trunk that follows you everywhere is a great convenience for travellers, but it is still luggage.

Who is paid. Travellers buy it, and I assume the thinking wood is rare and cannot be made by others, so whoever holds that wood keeps what is left.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A flying land that can travel gives its ruler new territory and command over everything below.

Who is paid. A state would pay for it as a public work and a means of rule, and its established builders would be paid to make it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Reaching the past would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching the past would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching other times would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Making one person unseen is useful to spies and soldiers and to few honest buyers.

Who is paid. I assume the public would be barred from it, so spy services and armies pay and their usual suppliers provide the treatment.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Seeing deep into solid ground would change the cost of finding ore, oil and water.

Who is paid. Mining and drilling firms would buy it, and the established makers of survey equipment could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would buy it, and as the substance could be copied once made, firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. A deadly cloud in space is a natural disaster, not a technology.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Speeding or slowing one's own time would be worth a great deal to the person who has it.

Who is paid. I assume it is fitted like a medical implant for private buyers, and that once one firm made it others could, so the makers and clinics that already fit implants collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. More room inside the same walls would cut the cost of housing where land is scarce.

Who is paid. Households would buy it, and since the coating could be copied the paint and building firms with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A worker who can shrink or grow could repair, inspect and operate where no tool reaches.

Who is paid. I assume hospitals and engineering firms buy it for staff, and a wearable device could be copied by many makers once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cooling at a distance would change refrigeration, firefighting and heavy industry.

Who is paid. Factories, food firms and fire services would buy it, and makers of cooling equipment would sell it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Personal flight without wings or fuel would be a new kind of everyday travel, though a narrower use than lifting freight and vehicles.

Who is paid. Ordinary people would buy it as they buy bicycles, and once one firm made it many could, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Gripping and moving things at a distance would change towing, cargo handling, building and rescue.

Who is paid. Ports, builders and ship operators would pay, and with the method open to copying, makers of cranes, tugs and handling gear would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A beam that takes anything apart would be a decisive weapon and a tool for demolition.

Who is paid. Armies would be the first buyers, and the arms makers that already hold their contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Judged as the travel it allows: crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Nobody can own a realm open to every ship, so shipping lines would pay for the ships that enter it, and established shipbuilders who could copy the drive collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Personal flight without wings or fuel would be a new kind of everyday travel, though a narrower use than lifting freight and vehicles.

Who is paid. Ordinary people would buy it as they buy bicycles, and once one firm made it many could, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Lifting and pushing craft without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Lifting and pushing craft without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A pocket device that frees its holder from gravity would give people personal flight, a new industry beside cars.

Who is paid. People would buy it for themselves, and with many makers able to copy a small gadget no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. Cutting the planet loose from the Sun would kill everyone on it, so it is a hazard no one may use.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A rod of hardened light is a curiosity unless it is far stronger than ordinary materials, which the description does not say.

Who is paid. I assume it is sold as a material to workshops, and that many makers could produce it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Gripping and moving things at a distance would change towing, cargo handling, building and rescue.

Who is paid. Ports, builders and ship operators would pay, and with the method open to copying, makers of cranes, tugs and handling gear would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Looking into other dimensions satisfies curiosity and science more than any everyday need.

Who is paid. Public research bodies would pay, and the instrument makers that already supply observatories would build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It is only the switch for a force barrier, an accessory to the larger thing.

Who is paid. Whoever buys the barrier gets the key with it, from the same established suppliers.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Moving people and goods across any distance at once would replace most transport and change where people live and work.

Who is paid. Carriers would buy the machines and charge fares, and since others could build them once shown, the firms that already own stations and routes collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. A door that lets invaders pour in is a hazard to the people who build it.

Who is paid. Nothing is sold; it is a trap, and no one would knowingly pay for it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. Dead ash left after matter is destroyed is a waste product with no use given.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Moving distant objects without touching them would change cargo handling, towing and building work.

Who is paid. Ports, builders and ship operators would buy it, and the established makers of heavy equipment could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Spotting people who move through time matters only to whoever polices time travel.

Who is paid. Governments would buy it, and the firms that already supply their watch and patrol equipment collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Moving distant objects without touching them would change cargo handling, towing and building work.

Who is paid. Ports, builders and ship operators would buy it, and the established makers of heavy equipment could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Carving and holding open spaces in rock or sea would change tunnelling and undersea building.

Who is paid. Building and mining firms would buy it, and the established makers of their equipment could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Judged as the force put to work: carriers, builders and launch firms would pay, and as the trick could be copied, firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Unlike the working beams, this one is a weapon that drags ships to their ruin, which navies would prize.

Who is paid. Navies would pay, and the arms makers that already supply them would build it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Shipping lines and explorers would pay, and once one yard had built the drive others could, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A tiny living world in a laboratory is a research tool and a marvel.

Who is paid. Research bodies would pay, and laboratory equipment makers would build it once the method was published.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Lifting and pushing craft without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Lifting and pushing craft without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Seeing past events as they really happened would settle crimes and disputes and end most secrecy.

Who is paid. Courts and police would pay, assuming private use is restricted, and the firms that already supply them could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Shrinking goods and people would change the cost of shipping, storage and work inside the body.

Who is paid. Hospitals and carriers would buy the machines, and with many makers able to copy them no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Unlike the generators, this is a comfort worn by one traveller, a niche piece of crew kit.

Who is paid. Ship operators would issue it to crews, and a belt is simple enough for many makers to copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A door to another reality could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume it would be run like a space programme, with a government paying its usual contractors to build and guard it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Hearing any past conversation, even without pictures, would transform policing, courts and spying and end privacy.

Who is paid. Police, courts and spy services would be the buyers, and the firms that already supply them would build it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Reaching other times would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. Beings and objects from another realm are not a made thing.

Who is paid. Nothing is sold, since these are creatures and things found, not products.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one. It is named as an idea rather than a device, so it is judged as the working thing it describes.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A tiny cosmos in a laboratory is a tool for study, of interest to scientists more than to buyers at large.

Who is paid. Public research bodies would fund it, and the firms that already build large scientific equipment collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. An instrument for watching a tiny cosmos serves a few scientists only.

Who is paid. Public research bodies would pay, and the established makers of scientific instruments collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Shipping lines and explorers would pay, and once one yard had built the drive others could, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Gripping and moving things at a distance would change towing, cargo handling, building and rescue.

Who is paid. Ports, builders and ship operators would pay, and with the method open to copying, makers of cranes, tugs and handling gear would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. A substance imagined from a reversed cosmos has no stated use.

Who is paid. Nothing is sold; the description gives nothing anyone could do with it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Making things unseen would be prized by armies and police above all.

Who is paid. Governments would pay for it as a tool of war and spying, and the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Seeing what is coming would change how trade, insurance and planning are done, though the edge shrinks once many can look.

Who is paid. Firms and advisers would buy it first, and once many makers can build the viewer no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A stretch of time that repeats is an event in the story, not a technology.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It does the job cabled lifts already do, a little more neatly.

Who is paid. Building owners would pay, and the firms that already fit and service lifts would sell it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A way into another cosmos could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume a state would claim the opening and explore it like a space programme, paying its usual contractors to do the work.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Measuring gravity is a specialist need of surveyors and navigators.

Who is paid. Survey and navigation firms would buy it, and instruments like this can be made by many workshops, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A tiny cosmos in a laboratory is a tool for study, of interest to scientists more than to buyers at large.

Who is paid. Public research bodies would fund it, and the firms that already build large scientific equipment collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Judged as the travel it allows: crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Nobody can own a realm open to every ship, so shipping lines would pay for the ships that enter it, and established shipbuilders who could copy the drive collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Seeing any past moment, including a moment ago, would transform policing, courts and spying and end privacy.

Who is paid. Police, courts and spy services would be the buyers, and the firms that already supply them would build it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Moving people and goods across any distance at once would replace most transport and change where people live and work.

Who is paid. Carriers would buy the machines and charge fares, and since others could build them once shown, the firms that already own stations and routes collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A way into another world could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume a ship that enters another universe would be run like a space programme, with a government paying its usual contractors to build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Making the stars look farther away has no everyday use, so it is judged as a way to hide or deceive.

Who is paid. Only a government could pay for a field so large, and the firms that already build its great works collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching other times would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Moving people and goods across any distance at once would replace most transport and change where people live and work.

Who is paid. Carriers would buy the machines and charge fares, and since others could build them once shown, the firms that already own stations and routes collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Removing the jolt of sudden stops would make every fast vehicle safer and allow far quicker journeys.

Who is paid. Vehicle and ship builders would fit it, and since the method could be copied, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A way into another world could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume it would be run like a space programme, with a government paying its usual contractors to build and guard it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Walking through walls would change rescue, mining and spying, and would undo most locks.

Who is paid. I assume the public would be barred from it, so police, armies and rescue services pay and their usual suppliers build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Unlike the generators, these only hold one person's feet down, a niche piece of crew kit.

Who is paid. Ship and mine operators would issue them to workers, and many makers could copy them.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A house with far more rooms than its plot allows would cut the cost of housing where land is scarce.

Who is paid. Households would buy it, and since the design could be copied the builders and land owners already in the trade collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Personal flight without wings or fuel would be a new kind of everyday travel, though a narrower use than lifting freight and vehicles.

Who is paid. Ordinary people would buy it as they buy bicycles, and once one firm made it many could, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Removing the crush of hard acceleration would make launches safer and allow far quicker journeys, assuming it works beyond launch as other such screens do.

Who is paid. Vehicle and ship builders would fit it, and since the method could be copied, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Seeing what is coming would change how trade, insurance and planning are done, though the edge shrinks once many can look.

Who is paid. Firms and advisers would buy it first, and once many makers can build the viewer no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A flare that destroys ships is a hazard.

Who is paid. Nothing is sold; it is an accident to be avoided.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Stopping time inside a box would end spoilage and hold the badly hurt until help comes, assuming a container of household or shop size.

Who is paid. Homes, shops and hospitals would buy it like a refrigerator, and since it could be copied the appliance makers with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Hauling real objects out of earlier eras reaches the past as the time machines do, and would be worth an industry in salvage, study and lost materials.

Who is paid. I assume a state would keep for itself a machine that reaches into the past and could so alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Deep cold from a spray would cut the cost of freezing, of strong magnets and of other work that needs extreme cold.

Who is paid. Factories and laboratories would buy it, and since it could be copied the chemical firms with plants and customers collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Copying any object at will would make most goods nearly free for most people.

Who is paid. Assuming a home-sized machine, households would buy it, and since the first machine can copy itself no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A region sealed off from the rest of space would be prized as a hiding place and a vault, assuming that is its use.

Who is paid. Governments would pay for secure hidden space, and the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A way into another world could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume it would be run like a space programme, with a government paying its usual contractors to build and guard it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A burst of energy from a ship's jump is a side effect, not a product.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A field that stops star engines nearby would be the main defence of any world in an age of such ships.

Who is paid. Governments would pay for it, and the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Judged as the drive the word stands for: shipping lines and explorers would pay, and since others could build it once shown, established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It is a better pocket knife.

Who is paid. People would buy it in shops, and a small tool like this would be copied by many makers.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It does the job cabled lifts already do, a little more neatly.

Who is paid. Building owners would pay, and the firms that already fit and service lifts would sell it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Shipping lines and explorers would pay, and once one yard had built the drive others could, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. Matter colder than cold is a state of nature in the story, and the description gives no use anyone could put it to.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A barrier that stops any attack would reshape defence and policing, here in a size a person can wear.

Who is paid. Armies and police would buy it first, and since rivals could copy it the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. An energy beam used as a weapon is one arm among many, assuming that is its purpose.

Who is paid. Governments would buy it for their forces, and the firms that already hold arms contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Holding a prisoner in place without bars is a convenience for police and jails.

Who is paid. Governments would buy it, and the firms that already supply police and prisons collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Passing through soil and bedrock would change mining, tunnelling, rescue and survey work.

Who is paid. Unlike the devices for walking through walls, this one is described for the ground, so mining and building firms would buy it, and the established makers of their equipment could copy it and collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Stopping time over a wide area would let stores, patients or whole places be kept unchanged until wanted.

Who is paid. I assume a field this large is a public work, so a government pays and its established contractors build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Personal flight without wings or fuel would be a new kind of everyday travel, though a narrower use than lifting freight and vehicles.

Who is paid. Ordinary people would buy it as they buy bicycles, and once one firm made it many could, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A hovering walkway is a convenience for one site.

Who is paid. Site owners would buy it, and with the floating metal available many firms could lay such a path.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A star turned into a marker is a lighthouse for star travel, useful but a small part of that trade.

Who is paid. No ship could be charged for each sighting, so governments would pay, and the firms that already build their great works collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. A field from the galaxy's core is a fact of nature, and the description gives no use anyone could put it to.

Who is paid. Nothing is sold; nobody made it or can own it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Following a ship through its jumps matters to navies and police and to few others.

Who is paid. Navies and police would pay, and their established suppliers would build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Turning music into living creatures is a curiosity for collectors and pet lovers.

Who is paid. People would buy it for themselves, and with many makers able to copy it no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Casting a region into darkness has no everyday use, so it is judged as a show of force.

Who is paid. Only a government would pay for it, and the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Pulling goods and knowledge out of other times, later ones included, would be worth an industry of its own.

Who is paid. I assume a state would keep for itself a machine that reaches into other times, so a government pays and its established contractors build it; a head start from what it fetches does not stop others copying the machine.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Cancelling weight at will would cut the cost of lifting, carrying and launching, which changes transport and building more than it changes how most people live.

Who is paid. Carriers, builders and launch firms would pay, and since the trick could be copied once shown, the firms that already build vehicles and craft would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Going back to watch the past firsthand is travel to the past under a scholar's name, worth an industry in study, salvage and statecraft though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that reaches into the past and could so alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Seeing a person's life to come would change how people plan, hire and insure, though the edge shrinks once many can look.

Who is paid. Advisers and firms would buy it first, and once many makers can build the scanner no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A puzzle about changing the past is a problem of logic, not a product.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Pulling things out of other times, later ones included, would be worth an industry of its own even though this machine fishes at random.

Who is paid. I assume a state would keep for itself a machine that reaches into other times, so a government pays and its established contractors build it; a head start from what it fetches does not stop others copying the machine.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A rupture in time is a disaster, not something anyone would buy.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Seeing any past moment, including a moment ago, would transform policing, courts and spying and end privacy.

Who is paid. Police, courts and spy services would be the buyers, and the firms that already supply them would build it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Signals quicker than light would tie distant worlds into one market, an industry like today's long-distance networks.

Who is paid. Firms and carriers would pay for links, and the companies that already run communication networks would install it once it could be copied.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A probe sent to another universe serves science and curiosity.

Who is paid. Public research bodies would pay, and the firms that already build their probes would make it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Lifting whole buildings and towns off the ground and into space without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Containers bigger inside than out would cut the cost of storing and shipping almost everything.

Who is paid. Shippers and warehouses would buy them in bulk, and a box, once the method is known, is something many makers could turn out.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Knowing what is about to happen would be worth a great deal to traders, insurers and guards.

Who is paid. Firms would buy it first, but film is easy for many makers to produce once the method is known, and foreknowledge everyone has earns little for its seller.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Reaching the past would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. I assume a state would keep for itself a machine that can alter history, so a government pays and its established contractors build it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A place ships must pass through to jump between stars is worth what the trade through it is worth, as a strait or a harbour is.

Who is paid. Shippers would pay tolls to pass, and I assume the place can be held, so whoever holds it controls a route others cannot make more of.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A way into another world could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume it would be run like a space programme, with a government paying its usual contractors to build and guard it, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Cancelling the weight of light objects only is a convenience for lamps, chairs and small loads.

Who is paid. People would buy it for themselves, and with many makers able to copy it no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A weightless sports hall is one more kind of entertainment venue.

Who is paid. Promoters would pay to build it, and owners of venues and leagues would collect, since any builder could supply the sphere.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A ship that cannot be seen or detected would upset the balance of every navy.

Who is paid. Navies would pay, and the yards and arms makers that already build warships would supply it once the method spread.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Normal weight on ships and stations would make living and working in space healthy and practical, which is an industry's worth but only for those off Earth.

Who is paid. Ship and station builders would fit it as standard, and with nothing to stop copying, those established builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Shrinking goods and people would change the cost of shipping, storage and work inside the body.

Who is paid. Hospitals and carriers would buy the machines, and with many makers able to copy them no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Floating in bed between plates is a luxury, with the gravity trick used at its smallest scale.

Who is paid. People would buy it for themselves, and with many makers able to copy it no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Calling back the bodiless selves of people would be worth a great deal to families, assuming that is what it retrieves.

Who is paid. Families would pay, and the temples or clinics that already hold the means to house those selves again collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A far richer fuel would cut the cost of power for ships and cities, though unlike an endless source it must be made and used up.

Who is paid. Power and ship firms would pay, and once one plant had made the elements others could, so the firms that already own such plants collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Stopping time inside a box would end spoilage and hold the badly hurt until help comes, assuming a container of household or shop size.

Who is paid. Homes, shops and hospitals would buy it like a refrigerator, and since it could be copied the appliance makers with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. It is the dwelling of a living being, not a made thing, and the travel comes from the being's own powers.

Who is paid. Nothing is sold, since no one can make or own the creature that does the work.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Personal flight without wings or fuel would be a new kind of everyday travel, though a narrower use than lifting freight and vehicles.

Who is paid. Ordinary people would buy it as they buy bicycles, and once one firm made it many could, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A barrier that stops any attack on a whole city would reshape defence and be worth an industry of its own.

Who is paid. Armies and city authorities would pay, and since rivals could copy it the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A hovering mansion is a showpiece for the very rich.

Who is paid. Wealthy owners would pay, and established builders would put it up using lifting gear anyone could buy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Passing through solid walls would change rescue, mining and spying, and would undo most locks.

Who is paid. I assume the public would be barred from it, so police, armies and rescue services pay and their usual suppliers build it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Stopping time inside a box would end spoilage and hold the badly hurt until help comes, assuming a container of household or shop size.

Who is paid. Homes, shops and hospitals would buy it like a refrigerator, and since it could be copied the appliance makers with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Talking and stepping straight to another person anywhere would change how most people travel, work and trade.

Who is paid. People would buy the cards for themselves, and unlike a fixed gateway they need no sites or networks, so assuming many can make them no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Ships that outrun light would open other stars to trade and settlement, an industry of its own, though most people would never ride one. It is named as an idea rather than a device, so it is judged as the working thing it describes.

Who is paid. Shipping lines and explorers would buy the engines, and once the trick is known any shipyard could fit it, so the established ship builders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. Gathering rare magnetic particles in space is a niche supply trade, assuming they are wanted for compact motors.

Who is paid. Makers of machinery would buy the catch, and with open space free to any prospector no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A place ships must pass through to jump between stars is worth what the trade through it is worth, as a strait or a harbour is.

Who is paid. Shippers would pay tolls to pass, and I assume the place can be held, so whoever holds it controls a route others cannot make more of.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Unlike the hard barriers, this one only holds things back gently, so it is a better fence rather than a weapon.

Who is paid. Owners of venues, farms and sites would buy it, and a fence is the kind of thing many firms could make.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A wall nothing can pass would reshape defence, prisons and the guarding of valuable places.

Who is paid. Armies and police would be the main buyers, and with the method copyable among arms makers, the firms already holding such contracts would supply it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A barrier that stops any attack would reshape defence and be worth an industry of its own.

Who is paid. Armies and city authorities would pay, and since rivals could copy it the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A field that holds in air at a doorway replaces an airlock, a single fitting for the few who work in space.

Who is paid. Operators of ships and stations would buy it, and the firms that already supply their equipment collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Reaching other times would be worth an industry in study, salvage and statecraft, though few people would need it day to day.

Who is paid. Here the story has the state pay to send idle workers back, and its established contractors build the machine, since others could copy it once shown.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Flipping an object into its mirror image is useful mainly to makers of drugs and chemicals, a niche.

Who is paid. Chemical and drug firms would pay to use it, and assuming others could build their own once it is understood no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Stopping time for those inside would let a prison hold people at almost no running cost.

Who is paid. Because this one is a jail the state pays, and the firms that already build and supply prisons collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A field that holds air around the body would replace space suits, diving gear and much protective clothing.

Who is paid. Employers of people who work in harsh places would buy it, and a worn device could be copied by many makers.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A barrier that stops any attack would reshape defence and be worth an industry of its own.

Who is paid. Armies and city authorities would pay, and since rivals could copy it the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. The story treats it as a joke with wild side effects; assuming it can be steered, shipping lines would pay and shipbuilders who could copy it would collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A particle that makes compact power plants and other devices possible would change the costs of energy and arms, assuming it works as the series shows.

Who is paid. Makers of power plants and weapons would buy it, and since a particle of nature can be produced by anyone who learns how, no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Speeding up time in a zone would shorten growing, ageing, curing and testing across several trades.

Who is paid. Farms, factories and laboratories would buy it, and with many makers able to copy it no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. A stray object that could break cause and effect is a hazard, not a product.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. If ghosts were real, catching them would be a niche service like pest control.

Who is paid. Removal firms would buy the boxes, and a simple box could be made by many once the method was out.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A dwelling hidden from every kind of detection would be prized for secret bases and safe refuges.

Who is paid. Governments would pay for it, with a few very rich buyers besides, and the firms that already hold defence contracts collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Stopping time inside a box would end spoilage and hold the badly hurt until help comes, assuming a container of household or shop size.

Who is paid. Homes, shops and hospitals would buy it like a refrigerator, and since it could be copied the appliance makers with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

No prize. A raw medium beneath all matter is a feature of nature in the story, and the description gives no use anyone could put it to.

Who is paid. Nothing is sold, so nobody pays and no seller collects.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Catching ghosts is a niche service even assuming there are ghosts to catch.

Who is paid. Small removal firms would buy the packs, and with many makers able to copy them no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. It does the job cabled lifts already do, a little more neatly.

Who is paid. Building owners would pay, and the firms that already fit and service lifts would sell it once the method was known.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. Lifting and pushing craft without burning fuel would cut the cost of flight and of reaching space.

Who is paid. Carriers and launch firms would buy it, and since others could copy the device once it is seen, the established builders of aircraft and spacecraft collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A navigation aid for ships that outrun light is a needed part but only a niche within that trade.

Who is paid. Ship operators would buy it, and the established makers of ship instruments collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A vast prize. Moving people and goods across any distance at once would replace most transport and change where people live and work.

Who is paid. Carriers would build the gateways and charge fares, and since others could build them once shown, the firms that already own stations and routes collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Crossing between stars quickly would open new worlds to trade and settlement, an industry of its own, though most people's daily lives would change slowly.

Who is paid. Shipping lines and explorers would pay, and once one yard had built the drive others could, so established shipbuilders collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A way into another world could open new lands and materials, though what lies beyond is unknown.

Who is paid. I assume a state would keep a blade that opens other worlds and run its use like a space programme, paying its usual contractors; the description does not say the blade is the only one of its kind.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. A field that holds air and warmth would replace space suits, diving gear and much protective clothing.

Who is paid. Employers of people who work in harsh places would buy it, and a worn device could be copied by many makers.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. It is one fitting inside a ship, a neater way to move cargo down a corridor.

Who is paid. Ship operators would pay for it as part of the vessel, and established shipbuilders would fit it.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A large prize. A fixed link between far stars would carry all trade between them, an industry of its own.

Who is paid. Shippers would pay tolls, and whoever holds a wormhole mouth controls the only quick route, which others cannot simply copy.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Getting the answer to any calculation at once would change the cost of computing for every firm that uses it.

Who is paid. Firms would buy the computing by the job, and the companies that already run large computer centres would install it once others had shown how.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. Instant messages between planets matter only to the few people and machines working far from home.

Who is paid. Space operators would pay for the service, and the firms that already run communication networks collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A large prize. Stopping time inside a box would end spoilage and hold the badly hurt until help comes, assuming a container of household or shop size.

Who is paid. Homes, shops and hospitals would buy it like a refrigerator, and since it could be copied the appliance makers with factories and shops collect.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.

A small prize. A members' club with linked branches is a luxury for a few; I assumed the teleport booths already exist.

Who is paid. Members pay, and any club owner could do the same once the booths exist.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

A small prize. A safe store for messages is a small service; I assumed the travel through time already exists.

Who is paid. I assumed whoever runs the journeys pays for the store, and anyone can keep a vault, so no seller keeps much.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is not very sure of this one.

No prize. Cities hunting one another is a world order, a way a society is arranged, not a product.

Who is paid. Nothing is sold, so nobody pays and no seller keeps anything.

A model's judgement, not a reading, of the idea as if it worked the way its story promises. The model is fairly sure of this one.