Blows my mind that humanity used to live in what you and I would consider a legit fantasy universe:
https://www.smithsonianmag.com/history/how-a-tale-of-demonic-possession-predicted-the-decline-of-an-early-medieval-empire-180985596/
https://www.smithsonianmag.com/history/how-a-tale-of-demonic-possession-predicted-the-decline-of-an-early-medieval-empire-180985596/
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What stuff will people be like "wow they were so dumb, how did they not know xyz???"