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TIL about the Munich conference. British PM Chamberlain agreed to cede a portion of Czechoslovakia in return for Hitler's guarantee that he had no further territorial ambitions. On his return, he famously declared "Peace for our time". Five months later, Hitler invaded the rest of Czechoslovakia.

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D1pjg TIL a man that killed his estranged wife, her daughter who was 14 months old & their son who was 4 with separate knives to not “cross contaminate” their blood & “allow demons inside them to live” & then plucked out his own eyeballs & ate them in prison was declared sane.
9YPa7 TIL President Jefferson, a slaveholder, refused to recognize Haiti after the Haitian Revolution and imposed a trade embargo on them to ensure their economic failure, for fear that a successful slave revolt in the West Indies would inspire slaves in the US
9YmDM TIL that Buzz Aldrin, the second man on the moon, singlehandedly calculated an orbital technique called "Mars Cycling" which would allow for spacecraft to perpetually travel between Earth and Mars with only a single initial boost. Crew would board and return via a secondary spacecraft, saving fuel.
9QgB TIL that the division symbol is called an “obelus,” and was used in ancient manuscripts to mark passages that were suspected of being corrupted or spurious.
78EPb TIL that every president, former or incumbent since Andrew Johnson, has been alive at the same time as Herbert Hoover. Hoover (1874-1964) started this streak with Johnson (1808-1875), and will continue this streak into the next presidency regardless of who wins.