Cold fusion?
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Maybe, maybe not. I worked in a nuclear engineering department at the time & a lot of the grad students were basically like 'well the mechanism described isn't crazy & wouldn't it be cool?' They still didn't believe it, though.
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Franz Reichelt's Parachute Suit.
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Space elevators :(
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those work fine on Mars... just need to blow up two moons, no big deal. Hopefully the shock wave will sound like BARSOOM! when it hits.
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I want to say jetpacks but I'm not sure anyone said it couldn't work at the time it was first proposed...
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There have been demos of personal jetpacks! But they're crash-prone and not cost effective
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The Bloomberg campaign
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Perpetual energy?
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