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TIL that cavemen had relatively straight teeth and that crooked teeth are a modern phenomenon

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Z8Y7o TIL in 1919, having pitched 8⅔ innings in a game against the Athletics, Indians pitcher Ray Caldwell was struck by lightning. Despite being knocked unconscious, he refused to leave the game. He went on to record the final out for the complete-game win.
OoRER TIL that A&W restaurants in Canada are completely separate from A&W restaurants in the rest of the world, and have been their own entity since 1972.
0dWdM TIL - a "Duck's Ass" was a popular men's hairstyle in the 1950's, where the sides of the hair were slicked back, resembling the hindquarters of a duck
OoZka TIL That Isaac Newton was the one who discovered that white light is comprised of all of the colors. He even created a telescope that counteracts the effect this was having on refracting telescopes.
8albP TIL that Transparent Aluminum is a real thing -- Aluminum Oxynitride (AlON) is a ceramic composed of aluminium, oxygen and nitrogen.