If you could go into any year in the future and bring one thing back, how far would you go and what would you bring back?
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I would go to the year 2100 and bring back a storage device that I could use with current technology that held the entire contents of their equivalent of wikipedia, probably only to find out that none of their storage technology would work with ours at all.
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Physics textbook. Knowing what is possible (even if we don't understand it) is the hardest part of science.
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