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TIL that 10 million people (1/4 of USA population!!) physically attended the Centennial Exposition in Philadelphia, 1876 (see link, Yale Univ. Professor Blight, at time 6:00 in video)

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kJdlB TIL the human brain remains half awake when sleeping in a new environment for the first time. When we sleep in a new place, our brains are actually in survival mode, only turning half off, with one hemisphere remaining more “awake” than the other
XGmr TIL in 1962 the US Government proposed Operation Northwoods, a plan to commit acts of ‘false flag’ terrorism on American soil, for which Cuba would be blamed, in an effort to gain public support for a US invasion of Cuba. The plan was rejected by the Kennedy Administration
e07WE TIL: It's a common response, due to fight-or-flight, for children to hide during house fires. Since they cannot "fight" the danger their natural response is to hide from it.
magE TIL The current image of what everyone thinks Jesus looks like is actually 15th Century Cesare Borgia, the illegitimate son of Pope Alexander VI. Alexander VI commissioned Leonardo Di Vinci to recast Jesus in the image of his own beloved son Cesare Borgia.
R5w4w TIL that the first recorded person to fly was Yuan Huangtou, a Chinese former prince who was forced to participate in an experiment in 559 CE with other prisoners in which he was strapped to a kite and flown off a 33 meter tall tower. He was the only survivor and flew 2.5 km.