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TIL Volvo designed and patented the 3-point seatbelt. Recognizing the life-saving potential, Volvo eschewed licensing fees and opened the patent for use by any automaker without charge.

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V5WZ TIL in 1942 a British forest guard in India made an alarming discovery. Some 16,000 feet above sea level, at the bottom of a small valley, was a frozen lake absolutely full of skeletons.
OGkxe TIL Theremin - a musical instrument uses electric current to play it as strings
5YOgD TIL common baking soda will dry Super Glue (Cyanoacrylate) almost instantly and harden it so much that it can be used to repair chips in helicopter blades.
l7BLA TIL Elizabeth Holmes' father was a VP at Enron
4nE5 TIL that the soviets trained dogs to serve as anti-tank bombers, but because they used soviet tanks to train the dogs, the dogs attacked Russian tanks instead of their German targets.