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TIL that a year after he accidentally solved two famously unsolved statistical problems by mistaking them for homework, George Dantzig's same two proofs were accepted as his thesis; his 'unsolved problem' story loosely served as the setup for the plot of Good Will Hunting.

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via reddit.com

OodbL TIL about Mexican Repatriation in the 1930s. Scapegoated for taking jobs away from "real" Americans during the Great Depression, state and local governments illegally forced hundreds of thousands of fellow citizens into forced exile simply for having Mexican ancestry.
ne1Qo TIL about "the Singing Revolution" which happened between 1987 and 1991 in Estonia when people gathered in public places to sing national songs together despite the ban. This and the "human chain" from Estonia to Lithuania were among the events that led to the independence of Baltic states.
9eOp TIL Ore trains in Sweden traveling down to the coast generate five times the amount of electricity they use, powering nearby towns and the return trip for other trains.
lPdV TIL that once needing 13 liters of blood for a surgery at 13, a man by the name of James Harrison vowed to donate blood once he turned 18. It was found out that his blood contained a rare antigen which cured Rhesus disease. He has donated blood about 1,000 times and saved 2,000,000 lives.
9YoR7 TIL the dark meaning of This Little Piggy. “Went to market” (the meat market), “stayed home” (not ready for market), “ate roast beef” (fattening for market), “had none” (too young for fattening)