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TIL In 1977 we received a signal from deep space that lasted 72 seconds. We still don’t know how or where it came from.

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91em TIL Some fleas in a Flea Circus were glued to a base of a circus enclosure. Miniature musical instruments were then glued to the flea performers and the enclosure was heated. The fleas fought to escape, giving the impression of fleas playing instruments.
4X9dN TIL Long-eared hedgehogs are nocturnal mammals native to the arid deserts and steppes of Egypt through to Central Asia, where they typically live in burrows. Their ears are much larger than those of other species of hedgehogs and are considered an adaptation for heat radiation in desert climates.
xVgA0 TIL that the decision to kill Susan on Seinfeld wasn't made until there were scenes with her, Jerry, Elaine, and Kramer. Jason Alexander, George, had claimed she was hard to act with before then, but no one believed him until they experienced it themselves.
69EdQ TIL U.S. songwriter Billy Davis rewrote a UK jingle for the Coca-Cola Company. The song 'Buy the World A Coke' was rewritten again because people kept calling radio stations asking for the tune to be played. It subsequently became "I'd Like to Teach The World to Sing" and reached #13 on Billboard.
vP06R TIL John Ratzenberger came up with the Cheer’s character Cliff Clavin at his audition (for another part). On his way out the door he asked the producers if they had a bar ‘know it all’ and proceeded to improv the idea on the spot. They wrote it into the show.