A funny detail about this is that Feynman hadn't bothered to budget the $1000 for the prize. He thought someone would have to invent new tech to build the motor which would take years. If he had just gone a little smaller, say 1/100th of an inch instead of 1/64th, he might have gotten his wish.
Despite his disappointment he did keep his word and pay the prize. His wife was not happy.
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