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TIL that sustaining a second concussion before fully recovering from an initial one (even an extremely minor one) can cause a condition called Second Impact Syndrome, which causes severe brain damage 100% of the time and frequently results in death.

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BremL TIL that the 1947 ammonium nitrate explosion in Texas City, TX is considered one of history's largest non-nuclear explosions.
gla9 TIL while shooting “The Good, The Bad, and The Ugly,” Eli Wallach mistakenly drank acid left next to his drink, was accidentally hanged by a faulty stunt rope, nearly decapitated by a train passing overhead, and left on a horse with his hands tied behind his back when it panicked and ran away.
rRWeM TIL that the German pharmaceutical company Bayer knowingly sold blood-clotting agents infected with HIV to Asia and Latin America months after withdrawing them from Europe and the US
nx7Y TIL Polish troops raised an orphaned bear cub during WWII. He enjoyed drinking beer, and was trained to salute. He became officially enlisted as a member of the forces, and helped carry artillery during battle.
OoQP6 TIL about a man who planted an enormous guitar shaped forest as a tribute to his late wife.