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TIL Charcoal toothpaste whitens your teeth by sanding off your outer enamel

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Oov74 TIL Wings (1927), not Top Gun, was one of the first collaborations with the DoD (War Department) and Hollywood.
VMDXG TIL of Waverly Woodson, a black medic who treated at least 200 injured men on D-Day while injured himself. As he hit the beach a shell tore apart his landing craft, filling him with shrapnel. Despite this, he set up an aid station and treated wounds for 30 hours, at one point even amputating a foot.
0dX1j Today I learned that General Mills, the cereal company, used to have an electronics division that, in 1953, created the “black box” found in today’s airplanes.
aYAJ TIL in 1982, someone laced Tylenol capsules on store shelves across Chicago with cyanide, killing seven. While the perpetrator of this crime was never found, it did usher in the development of tamper-proof packaging for over-the-counter drugs, which is now an industry standard.
R5dKj TIL that Boston Corbett (soldier who killed John Booth) castrated himself with a pair of scissors to avoid temptation upon seeing prostitutes