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TIL bicycle stability is actually a quite difficult mathematical problem and was fully explained no sooner than 2007

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neL0Y TIL about pan-human love. In past 300k years, we overlapped with 6 known human species. All but us now extinct, though we interbred and carry the DNA of at least two (Denisovans, Neanderthals). Some Neanderthal skeletons carry our DNA too. Denisovans and Neanderthals mixed separately from us also.
5VPJP TIL Simpsons writer Brent Forrester went to Lollapalooza as research for the episode Homerpalooza. He had a horrible experience which inspired several jokes for the episode: cameras being siezed and thrown in the trash, a freak show, and at one point a stranger asked him, "How's it going, narc?"
b6oW4 TIL that In 1518, the dancing plague in the Holy Roman city of Strasbourg saw some 400 people dance uncontrollably for weeks on end — leaving as many as 100 of them dead.
LkYKV TIL over Newgrange, a prehistoric tomb in Ireland. It is pitch dark in the tomb the whole year, except for 15 min around Dec 21, when sunlight illuminates the niche in the front.
kOxwd TIL that John Mulaney started drinking at 13 years old and that the psychiatrist his parents made him go see as a teenager once described him as “one part nice kid, one part gorilla that wants to kill the other half.”