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TIL The Concorde supersonic jet stretched during flight due to the heat it generated. On its final flight the crew placed their hats into a crevice in the floor which appeared during the flight, as the aircraft cooled the crevice closed, permanently sealing their hats in the aluminum airframe.

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WmpX TIL taking a daily multivitamin is a highly contentious topic with studies proving it a useless, potentially harmful, waste of time/money and other studies proving it a beneficial way to insert minerals which would otherwise be non-existent in the average diet.
nKBo TIL During 2012 Missouri drought, a man named John Sam Williamson hauled about 3000 gallon of water from Missouri river to keep a 350-years old tree alive. The tree sits on the farm his family has run for six generations.
wg7o TIL Carl Sagan was brought in to mediate an argument between Stanley Kubrick and Arthur C. Clarke about what the aliens should look like at the end of “2001: A Space Odyssey.” Sagan suggested to not show them at all.
dlyB TIL Harry Truman was once a member of the KKK
0D7N TIL that during the Japanese invasion of China, two soldiers challenged each other to kill 100 people using only a sword. Since both surpassed 100 in the heat of battle without a clear winner, they decided to raise the challenge to 150 people.