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TIL there is a linear relationship between sleep and cognitive functioning: more sleep leads to better cognitive performance, and vice versa.

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GYm41 TIL carrots don't actually improve vision; the British government began touting carrots' health benefits during World War II to lure consumers away from rationed foods.
e08xn TIL The exclamation "Yee-haw" was invented by Hollywood. It may have come from the terms to lead a team of horses right (gee) and left (haw).
Jra8 TIL of Cymothoa exigua - a parasite that severs the blood vessels of a fish’s tongue and becomes a new functional tongue. Only known parasite to replace an entire organ.
98r7 TIL in the first edition of “The Hobbit,” Gollum willingly bets his ring in the riddle game with Bilbo and the two part on good terms. Tolkien changed the story in the second edition to reflect the corruptive powers of the ring taking shape in “The Lord of the Rings” trilogy.
X00mk TIL NY State prosecuted a fake architect named "Newman," and called the investigation "Operation Vandelay Industries," based on two Seinfeld characters, including fake architect George Costanza, aka "Art Vandelay."