Useless but fun speculation of the day: If you were suddenly transported back to the 12th century, what useful modern inventions could you re-create, using only then-current technology, or technologies you made from then-current technology?
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Witchcraft!!!
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You'll have to start with distillation first, which was not widely known until the 14th century.
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Good way to finance the rest of your technological endeavors.
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That's a good one
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Just washing hands with soap before any number of activities... humanity went through a LOT of unnecessary death and suffering.
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Also Variolation ( precursor to vaccination ), hand washing and chlorinated water. Interesting that some of the easiest technologies to bring back would be medical ish.
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Where do you get the chlorine?
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thats a good one
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yeah, pretty much any personal behavior technology travels. E.g. washing hands with soap and water.
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The hero of Lest Darkness Fall makes his fortune in Ancient Rome with a still: https://www.isegoria.net/2010/12/ideas-behind-their-time/comment-page-1/ …
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