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TIL in 1973 two men were stranded 1,575 feet below the ocean when their submarine buoyancy tank inadvertently flooded. They were rescued after 76 hours with only 12 minutes of air remaining. It was the deepest underwater rescue mission in history.

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OGkb1 TIL that in 2020, Burger King ran an advertising campaign featuring a picture of a moldy Whopper, to prove that their burgers are made without preservatives. This unconventional advertising method worked, increasing sales by 14% (according to multiple sources.)
RMra TIL the Battle of Vimy Ridge was the first time when all four divisions of Canada’s army fought together. They had captured more ground, more prisoners and more guns than any previous Allied offensive in the two and a half years of war up to that point. Today is the 96th anniversary of the assault.
AD1Pa TIL A cockroach will fart about every 15 minutes.
16xPO TIL when a cat purrs, it can mean more than just contentment. Cats also purr when they are frightened, in pain, or even when they are expiring. It's considered a self-soothing, and self-healing mechanism, as their 25-150Hz frequency purr vibration can improve bone and soft tissue regeneration.
gMoP4 TIL that when a critic insulted the nudity in Michelangelo's The Last Judgment, the painter punished him by painting the critic's likeness onto the body of Minos, the judge of the underworld; he then further insulted the critic by giving the likeness donkey ears and having a snake bite his genitals.