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TIL about African-American boxer Joe Louis and Nazi boxer Max Schmeling. The two fought each other for the World Heavyweight Championship twice in the 1930s and went on to fight in WW2. They later become close friends.

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OMJ4 TIL a POW named Charlie Cavendish told Swiss inspectors of the awful conditions that they were living in. He knew that the SS would kill him for doing so, but continued anyway to save his fellow men, which he did. Cavendish was missing at roll call the next day and was never seen again.
gKM4 TIL during the cleanup of the Cocoanut Grove fire in 1942 (which killed 492 people) firefighters found several dead guests sitting in their seats, with drinks in their hands. They had been overcome so quickly by fire and toxic smoke that they hadn’t had time to move.
xvrk TIL that between 50-100 Americans currently use a plutonium-powered pacemaker. They are to be returned to Los Alamos upon the owner’s death.
Z8mvQ TIL: Bananas (and kitty litter) are radioactive enough that they frequently trips the sensors at U.S. ports of entry meant to detect nuclear material being smuggled in shipping containers.
o9go TIL The shower of sparks seen during Space Shuttle launches are often assumed to be engine igniters but they’re actually part of the Hydrogen Burnoff System; a safety system designed to consume unburned hydrogen so it doesn’t damage other parts of the shuttle.