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TIL that Harvard University was founded before calculus was even invented. Harvard was established in 1636, while Isaac Newton and Gottfried Wilhelm Leibniz developed calculus in the late 1600s.

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Vab0 TIL that U.K. Kids Spend Less Time Outside than Prison Inmates
KO7Xw TIL the United States made Laos the most-bombed country per capita in the world, dropping more than two million tons of ordnance (an average of one ton per citizen) on Laos during 580,000 bombing missions between 1964 and 1973.
Q77E TIL baby male monkeys prefer to play with trucks and baby female monkeys prefer to play with dolls, indicating a biological predisposition towards these gender stereotypes
Lev9 TIL The US state of Mississippi ratified the Thirteenth Amendment to the Constitution that abolished slavery on Feb. 7, 2013.
XE4Yk TIL of the "Petticoat duel"; in 1792, Lady Almeria Braddock challenged Mrs. Elphinstone to a duel in London's Hyde Park over remarks the latter made about the former's true age; they duelled with pistols, then with swords, until Mrs. E agreed to write Lady A an apology.