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I know you can never prove that something doesn’t exist or cannot be possible; but what are some things people postulated in science fiction and futurism circles that we got around to trying to do that failed because the science around it was just not there?
A good example would be cold fusion (although you could argue that it’s still on the table and we just aren’t close to achieving it anytime soon).
Any other examples?
I... Feel like definitively saying something that doesn't actively violate thermodynamics or relativity doesn't work is even more arrogant than definitively saying it WILL work.
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