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TIL the Air Force recently invented underwear for fighter pilots that automatically detects urine and flushes it into a sack where it freezes the urine for disposal after the flight, solving a major problem of inflight peeing.

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WkEKB TIL Bette Graham became a typist to support herself and her son Michael in 1951. She was a poor typist and invented a white tempera paint to cover her mistakes. This led to her business Liquid Paper Co. which she sold 25 years later for $48 million. Michael went on to become a member of The Monkees
VMYjD TIL Canada and Denmark have a territorial dispute over Hans Island in which each country removes the others flag and leaves bottles of alcohol (whiskey from Canada and Schnapps from Denmark) every few months for the other countries military when they return to reclaim the island.
VMalQ TIL Sigmund Freud considered believing in a single god to be a delusion. He also stated that religion "comprises a system of wishful illusions together with a disavowal of reality, such as we find in an isolated form nowhere else but amentia, in a state of blissful hallucinatory confusion".
n997 TIL: Dr. Dre has been financing Burning Man since 1995
mxMBM TIL the term factoid originally meant a piece of information that was accepted as a fact but wasn't true, or a made up fact that is accepted as true due to it appearing in print.