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TIL In 1970, psychologist Timothy Leary was sentenced to 20 years in prison. On arrival, he was given a psychological evaluation (that he had designed himself) and answered the questions in a way that made him seem like a low risk. He was assigned to a lower-security prison from which he escaped.

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pww4 TIL that the female spotted hyena is the only mammalian species to lack an external vagina, and gives birth through a pseudopenis. This penis is used for communication and can become erect.
oByGE TIL about a highly complex structure known simply as "E8"', a weird 8-dimensional mathematical object that for some, strange reason, appears to encode all of the particles and forces of our 3-dimensional universe.
R58j9 TIL about Troy Hurtubise, a Canadian man who built multiple suits of armor to study grizzly bears up close in nature. He'd test these by having his friends hit him with 2x4s or drive trucks into him
d8bx9 TIL the glass of airplane windows block out UVB rays to prevent passengers from getting a sunburn.
6jV7 TIL Saudi Arabia tore down a centuries old Turkish fortress, at one time used to protect Mecca and the Kaaba from invaders and bandits, to build a Megahotel complex.