The initial queries helped orient the machine-learning system to find prior art on perpetual motion. There’s quite a bit, but ...

Perpetual Motion Machines Over the past 400 years numerous inventors have proposed marvelous ways of getting something for nothing. All these proposals have foundered on either the first or the ...

Villard’s machine An architect named Villard de Honnecourt drew an impractical perpetual motion machine in the 13th century that was also an overbalanced wheel. His device, and other similar ...

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