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TIL the word “dude” originally referred to an extremely well-dressed male from the East Coast and was slang for cowboys who catered to such city-slickers on “dude ranches”, or guest ranches. In the 1960s and 70s it evolved to its current usage starting out with surfer culture.

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N79NN TIL in January 2018, China implemented its "National Sword" policy, which banned the import of materials for recycling within China. Prior to China’s ban, 95 percent of the plastics collected for recycling in the European Union and 70 percent in the US were sold and shipped to Chinese processors.
ba59 TIL of the D-Day(June 6) Crossword Panic of 1944 in which, in the 35 days before the invasion, 5 obscure, top-secret code words appeared in the Daily Telegraph puzzles..The words ‘Utah, Omaha, Overlord, Mulberry and Neptune’ triggered a MI5 investigation.
0wXL1 TIL that many ancient statues weren't meant to be white. Over time, the paint on the statues wore off, and were completely colorless upon their discovery. This lead many sculptors to believe that the refined Greeks and Romans left their marble bare intentionally, creating a lasting trend.
0wonj TIL a ship loaded with ammonium nitrate exploded in Texas in 1947. It remains the worst industrial accident in US history.
a8pl0 TIL there are 18 episodes of The Twilight Zone (season 4) you probably haven’t seen before because they are 1 hour long and don’t fit the typical 30 min slot for reruns.