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TIL in literature there is a principle called Chekhov’s gun. This principle requires that every element in a text is necessary with no extra information at all.

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M7Qg7 TIL that a BBC variety program called "the Black and White Minstrel Show" — featuring white people singing and dancing in blackface — was broadcast until the late 1970s. Watched by 12-16 million Britons every week, it won awards and made it onto screens in many other countries, including Australia.
QLk TIL that Americans have less sex than everybody else
Me9pb TIL of Whittier, Alaska: A Community Under One Roof. It's a town that features a hotel and everyone in the community lives there and shares provisions. It's very hard to get to using a map and hard to enter considering that they physically block people out after a certain time.
Z88vo TIL Paralympic medals have steel balls inside them which, when shaken, makes a rattling sound that helps notify visually impaired athletes to determine between medals.
VM1AQ TIL Carl Sagan wrote a peer-reviewed paper while at Stanford with a NASA grant outlining it is probable aliens have visited the earth and feasible they have impacted our civilizations.