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story identification - Scientists shown a fake anti-gravity device to motivate them to build the real thing


There exists a SF short story about anti-gravitation called the Mother of Invention (AFAIK). A bunch of scientists are shown a (fake) movie in which an anti-gravity device is demonstrated by an inventor. The scientists are told the inventor's notes were lost/destroyed and they have to start from scratch. The bottom line - there was no anti-grav invention, the scientists needed to believe it had been invented so they would think 'outside the square'.


Anyone know who wrote the short story, and has anyone got a copy?




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