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TIL that Carl Sagan wrote an article, under a pseudonym, that professed the wonders of marijuana. He was revealed as the author after his death.

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QN0XM TIL it was revealed who forgot to flush in the infamous 'Disgustang' video. The younger sister made a followup video to admit to it in 2014, but it did not surface until 2019.
Ovx1 TIL that during the Battle of Moscow, despite German forces closing to within 50 kilometers of the city, the Soviet Union still held the annual military parade marking the revolution. Soviet troops who paraded past the Kremlin, then marched directly to the front line and into battle.
YpkK7 TIL between 1977 and 2015, the college textbook industry has increased its prices by 1,041%. This was managed through aggressive business tactics such as forcing students to buy new versions of the same textbook and incorporating more pictures into a text to increase its length.
NXQbe TIL that Batman was created almost at the same time as the Black Bat, a pulp fiction hero so similar that the publishers considered suing each other. They eventually found an agreement: the Black Bat wouldn't appear in comics, and in exchange, Batman wouldn't appear in pulp magazines.
YpLov TIL about the spotlight effect, a phenomenon in which people tend to believe they are being noticed more than they really are. It comes from the innate tendency to forget that although one is the center of one's own world, one is not the center of everyone else's.