this post was submitted on 13 Feb 2023
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Math, some simple tools like 19th century plows, better crop rotation and artificial selection, 17th century and later metallurgy. Basic but useful electricity, a motor can be made from wire and magnets.
Much much better medicine. I can definitely recreate penicillin and gramicidin, ether, basic surgery. I can make small amounts of aluminium, also a map of accessible high yield ore deposits.
Once super rich steam engines and telegraphs and better ships become possible, but the trick is giving people what they actually need and avoiding the "man who came too early" scenario.