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TIL the planet Mercury has a comet-like tail 15-million miles (24 million kms) long. The tail is made of sodium atoms blasted off of the surface of the planet by the Sun and small meteorite impacts. The tail is very faint, invisible to the naked eye.

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795M TIL that in 2013, Bill Gates admitted that the Ctrl+Alt+Delete command was a mistake, and should have been a single button
nRKB TIL Walt Disney personally hated the Goofy character and found its cartoons to be ‘stupid’. The only reason he didn’t axe the character is because it gave work to so many animators.
d8dL9 TIL studies have found coffee drinkers (those who drink 3-5 cups per day) have a more “efficient” brain than those who don't drink coffee. MRI scans found coffee drinkers have quicker connectivity in the cerebellum, the right precuneus, and the right insular.
WaJX TIL that in 1942, a US Navy Captain successfully sank a German U-Boat off the Louisiana coast. The Navy disbelieved his report because he “hadn’t received anti-submarine training” and reprimanded him and his crew for what they presumed must have been a “sloppy” attack. He was removed from command.
xVdMD TIL Tom Lehrer's famous song "Poisoning Pigeons In The Park" was inspired by the City of Boston doing exactly that. The city spread strychnine-laced corn in its public parks to reduce the pigeon population