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TIL that roughly 170,000 small air craft in the USA, and some in the UK, still use leaded fuel.

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Z1bv TIL that there was a sculptor named Anna Coleman Ladd who directed a mask-making studio in Paris where she sculpted masks to be worn by men who had been badly disfigured during WWI, and made to resemble the soldiers’ former selves.
VmyZ TIL That in World War I, the Germans tried to use a picture of Quentin Roosevelt’s body as propoganda to increase moral. This backfired, as soldiers wondered why the sons of American Presidents were fighting and dying at the front, while the Kaiser’s sons were not.
WkOxY TIL a Senior Judge of the US Court of Appeals was involved in running Operation Match, the first US computer dating service, after he dropped out from Cornell University due to "boredom".
Y7PB TIL that the annual cost of religious tax exemptions is 71 billion, nearly 4 times greater than the budget for NASA
8aPkV TIL Willie Nelson was close friends with Frank Sinatra, and they made a series of PSA's about space travel together in the 70s.