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TIL despite the widespread modern belief that the Library of Alexandria was burned once and cataclysmically destroyed, the Library actually declined gradually over the course of several centuries.

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KaMG TIL on April 5, 1943 the Destroyer USS O'Bannon encountered a Japanese submarine. Too close to fire their guns, the crew threw potatoes at the Japanses sailors, who thought they were grenades, distracting them long enough to get distance from the sub, fire their guns, and eventually sink it.
69ME8 TIL when seeking an alternative to scarce copper for the Manhattan Project, Manhattan asked the Treasury for 6,000 tons of silver and were told that the Treasury did not deal in tons, their unit was the Troy ounce. Manhattan would eventually borrow 408 million Troy oz (14,000 tons) of silver.
LQVVP TIL Leslie Nielsen trained as an aerial gunner during World War II, but he was never sent overseas.
Yp987 TIL A recent development in Hoarding Disorder is the hoarding of data. This is where someone stores huge amounts of electronic data and emails that they're extremely reluctant to delete.
W7wOd TIL there is a patron saint for hangovers, and her name is Bibina