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TIL of "Palilalia," a condition in which some people repeat their own words to themselves, usually although not always under their breath.

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Y70eZ TIL of "Looking Glass", a 24 hour a day US military operation that lasted for 29 years
4Xmjw TIL the nuclear bomb tests in the 1940s can help identify forged paintings by using radiocarbon dating. Authenticators can count the number of carbon 14 isotopes and decide whether the number is realistic for the time. Carbon 14 isotopes are known to have dramatically increased after these tests.
Zpb9R TIL Richard Hunt was one of the earliest performers of Elmo on Sesame Street in the mid 80s. However, he quickly grew so frustrated with the puppet that he literally squeezed it and threw it at Kevin Clash, who then performed Elmo until 2012 when Kevin resigned from the show.
Y9GP TIL there are more than 1 million Catholics in Saudi Arabia
WkopL TIL that Domhnall Gleeson, who played Bill Weasley in the Harry Potter movies, is the son of Brendan Gleeson, who played Mad-Eye Moody.