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TIL that George Washington, Ulysses S. Grant and Dwight D. Eisenhower are the only Presidents not to have held a political office when running for President of the United States

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X0Jy6 TIL humans can differentiate between hot and cold liquids by sound
Z8moD TIL In 1992, shipping containers with around 28,000 rubber ducks were lost in the Pacific Ocean. Ducks are still being found today.
BrxlL TIL in 2006 a wine-tasting robot confirmed that human flesh tastes like pork (especially bacon)
R7loa TIL: Martin Couney set up infant incubator shows at Coney Island, Atlantic City and World's Fairs, charging 25c to view premature babies. He offered free care for 'weakling babies', proving the success of incubators. He saved over 6,500 babies from ~1900-43.
611Q TIL in 1976, a struggling Princeton undergrad wrote his junior term paper on how to make an atomic bomb, using information he gathered from physics textbooks and declassified documents. He got an A in the class, but never got his paper back because it was seized by the US government.