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TIL In 1950, Sen. McCarthy claimed that communists have infiltrated the federal government. On being confronted by Sen. Tydings about these allegations, McCarthy’s staff retaliated by circulating a composite picture of Tydings with the then leader of the American Communist Party.

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GYNeJ TIL Spain’s S-80 submarine program designed subs that were 70 tonnes too heavy, and likely sink when submerged. Cost overruns to fix it are expected to reach $9 billion. The problem was traced back to an engineer misplacing a decimal point, and had been called the most expensive math error ever.
b9AAQ TIL that our own stomach has to constantly secrete mucus to stop itself from being digested by our own stomach acid. Without that mucus, our stomach acid would eat through our stomach’s lining.
OGjA7 TIL about Saint Marina the Monk, a 6th century woman who disguised herself as a male Monk to avoid marriage. Another woman falsely claimed her child belonged to Marina, believing she was a man, but Marina raised the child anyway. The truth of her real gender wasn't discovered until her death.
wLrpo TIL of the Felony Murder Doctrine, where any killing that occurs in the course of a dangerous felony can be charged against the felon as first-degree murder. This can lead to strange results. If you rob a store with your brother and he is shot by the clerk, you can be charged with his murder.
XEy88 TIL about Leonardo Da Vinci's Self Supporting Bridge. This Bridge has NO Nails, Screws, Glue Or Fasterns. Just Friction And Gravity