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TIL that during the Mexican revolution (1910-1920) 2 presidents were exiled and 4 were assassinated or murdered.

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Oo4DX TIL that Bill Gates' mother, Mary, knew John Opel, CEO of IBM, because both served on the national United Way committee. At Mary's request, Opel set up a meeting with Bill Gates, CEO of then-small software firm Microsoft, to discuss the possibility of using PC-DOS for IBM's about-to-be-released PC.
WkOkX TIL the "D" in the SD card logo is actually an optical disc, because the image was borrowed from Toshiba's unsuccessful Super Density (SD) Disc standard.
rXDe TIL that color-blindness in humans happens when a person has two visual processing cones instead of the usual three. There is a flipside, that there are people who have a condition known as Tetrachromacy, where someone has four cones, potentially allowing them to see more of the visible spectrum.
8epdP Today I learned there are microbes and diseases plushies!
XEQMX TIL that Star Trek II: The Wrath of Khan was patterned heavily after Herman Melville's "Moby Dick" . Many of the lines Khan gives are copied or otherwise patterned after Ahab's while Khan himself obsesses over his personal white whale, the Enterprise and her captain.