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TIL Xerox and Cannon created the Machine Identification Code. A digital watermark which certain color laser printers and copiers leave on every single printed page, allowing identification of the device with which a document was printed and giving clues to the originator

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V4Jp TIL screen legend beauty Hedy Lamarr was also an inventor who designed a jam-proof radio guidence system for torpedoes which is one of the basic sources behind spread spectrum communication like blue-tooth technology, GPS, wi-fi, and cell phones
m1nlE TIL The serial fraudster Charles W. Morse (AKA 'Ice King' from his New York ice monopoly) received a pardon from President Taft. The pardon was because Morse had Bright's Disease and would likely die in prison, it was later revealed that Morse had been consuming soap and chemicals to fake illness.
ADbgo TIL that eating raw or undercooked Shiitake mushrooms, causes a dermatological condition that causes primarily an itchy whiplash like rash, called shiitake mushroom flagellate dermatitis
5YXjp TIL that in 1736 the mathematician Leonhard Euler was trying to find a way to cross every single one of the seven bridges of Königsberg exactly once. He realized that this was, in fact, impossible and based on that created a new area of mathematics called Graph Theory.
yVAWl TIL the only survivor of a mid-air collision between 2 planes over Amur Oblast (that killed her husband & 36 others) fell 5,220 meters while holding onto a piece of the plane. After waiting 2 days in the woods with fractures to her arms, ribs & spine, she began to walk on the 3rd & found rescuers.