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TIL about "lonely negatives". These are words with common prefixes or suffixes such as "dis-", "in-", "un-", "-less" but they don't have positive counterparts such as the words "disgust", "disappoint", "reckless" - they don't have "gust", "appoint", or "reckful" as their opposites.

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BjLK TIL that, due to a wartime shortage of copper, the Manhattan Project borrowed almost 15,000 tons of silver from the US Treasury to make wiring for the electromagnets in isotope-separating mass spectrometers. The wire, worth over a billion dollars at the time, was removed and returned after the war.
Ook46 TIL the frontman to Powerman 5000 is the brother of Rob Zombie and was also on the original 90210.
dD40Z TIL Dr Stewart Adams OBE, who led the team at Boots the Chemists which discovered Ibuprofen, tested the drug on his own hangover.
5Yjv9 TIL of US Army Major General Peter Conover Hains, the only Civil War officer to see duty in World War I
1vxD TIL that in May 1959, when Billie Holiday was taken to Metropolitan Hospital in New York with liver and heart disease, she was arrested for drug possession as she lay dying. Her hospital room was raided by police and she remained under police guard until her death in July.