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TIL Einstein didn't believe it was possible for 2 photons to communicate instantly, no matter how far apart they were, because it would mean that information is travelling at a speed faster than light. It turns out that Einstein was wrong: it's possible, and it's known as quantum entanglement.

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via reddit.com

5Ydnn TIL that a "macaroni", as mentioned in Yankee Doodle, refers to a 1700s trend wherein some men would dress up in ridiculously over the top clothing and speak in a gender-ambiguous manner. The name came from young men who had toured Italy referring to fashionable things as "very macaroni".
yVvGa TIL the condom brand name Durex is an acronym, constructed from the phrase "DURability, REliability and EXcellence".
Ed0P TIL that the actress who voiced Snow White in the original Snow White and the Seven Dwarfs was forbidden to appear in any other film, television or media after the film was released until her death. Disney didn’t want to “Ruin the illusion of Snow White.”
ne9x9 TIL of Lydia Litvyak, The Jewish Soviet Fighter Ace. During WWII she claimed 14 kills, trained 45 pilots, and shot down an ace who wouldn't believe a woman beat him until she described the fight. She went missing on a flight Just before she was to receive the award "Hero of the Soviet Union"
PYkWg TIL Nan Madol, “Ghost City of the Pacific”, megalithic basalt stone structures weighing 800,000 tons, standing 25 feet high and 17 feet thick covering 200 acres built on the coral reef 1,000 years ago in Pohnpei, Micronesia.