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TIL that the term “mental retardation” which we now deem “inappropriate”, was a medical term for people with intellectual impairments, invented to replace terms that were more offensive. The American Association on Mental Retardation introduced it to be a neutral term in 1961.

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e0mOg TIL Earth's only natural satellite has no other name and is simply called "the Moon" because people didn't know other moons existed until Galileo Galilei discovered four moons orbiting Jupiter in 1610.
KYdMQ TIL the true story of Moby Dick. A whale sunk a crew’s main ship - leaving 3 sailboats. They’d live if they sailed to a nearby island. Out of fear from (false) stories of cannibalism, they tried going back to the mainland. In tragic irony, they got lost at sea and had to resort to cannibalism.
J1mbB TIL Hitler was never elected to rule Germany. The president appointed him as chancellor because of pressure from the political elites and corporations.
nN6W TIL that the actors who play Mac and Dee on It’s Always Sunny are married…so are Charlie and the waitress as well as Dennis and the girl from “The D.E.N.N.I.S. System” episode.
rRb1x TIL that, while often used interchangeably, “prejudice” refers to preconceived ideas about a particular group regardless of reason, “bigotry” denotes discriminatory behavior without need for any system or power, & “racism” involves the unequal distribution of power on the basis of race.