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I wonder how much you could finesse this. Just the slightest of nudges could cascade into current tech suddenly advancing hundreds of years...
My tentative ideas:
>microscope back to the middle ages. Or, at least, to that guy in London who figured out certain wells had a higher likelihood of causing cholera
>simple load cell/battery to Leonardo Da Vinci
>introduce fire to the first cavemen, but a few hundred years earlier
>computer/binary theory to the Greeks who created the Antikythera mechanism