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TIL: The 'Super Trouper' in the ABBA song is a powerful theatrical follow spotlight. The lyric is about being the star of the show, the one that the brightest spotlight follows.

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QJDm9 TIL of Christopher Langan, the "smartest man in the world" who broke the ceiling of the IQ scale when tested. He worked as a bouncer in Long Island for 20 years while developing his Cognitive-Theoretic Model of the Universe about the relationship of reality and the mind
Y77er TIL about the Haber–Bosch process which allows for the creation of ammonia easily. Which is one of the key factors in the massively increased agriculture ability of the modern era as the ammonia is often used in fertiliser.
ORY1 TIL that from 1902-1907, a group of 12 scientists regularly ate dangerous, common food additives that had previously been untested, such as formaldehyde, and documented how they reacted to said additives. They were known as “The Poison Squad,” and helped spur the creation of the FDA.
epEVD TIL the most divorced person ever of monogamous marriages was a baptist minister. He had married 31 times, mostly to teenagers, because he just “spoke their language” and ONLY five marriages end by the death of the spouse.
P1nXe TIL that the largest earthquake in history was in Valdivia, Chile with a magnitude of 9.5 and a fault line of over 1000 miles. A magnitude 10 quake or higher is impossible because the fault line would have to encircle the earth, and no fault line is that long.