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TIL Sharks are able to feel the harts of fish beating, so playing heavy metal (or other music with low, rumbling frequency) will attract sharks, as they think the music is fish.

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ADy9l TIL that the iconic theme to the original Legend of Zelda was arranged in one night from the music used in-game. Nintendo had originally intended to use a reworked version of Ravel's "Bolero", but discovered immediately before launch that the copyright had a month before expiration.
7rkwP TIL: King Zog I of Albania, had 600 blood feuds; survived 55 assassination attempts, had shot back at his assassins; smoked 200 cigarettes a day; escaped from France with help from Ian Fleming.
4k04N TIL a teen who had a diet of French fries, Pringles, white bread, and an occasional slice of ham or sausage was found to have severe vitamin deficiencies and malnutrition damage, and he had developed blind spots in the middle of his vision. It is stated that his sight loss is permanent.
l70Q5 TIL of the Crank Machine, a 19th Century device used in British prisons to keep prisoners occupied by turning sand within a sealed box. See also: the Penal Treadmill
PlxG TIL - One teaspoon of water contains about three times as many atoms as the Atlantic Ocean contains teaspoons of water