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TIL "The Beatles" would never have been seen on American TV but for the JFK assassination. CBS executives decided that America needed something light-hearted on the news to take the nation’s mind off the painful assassination and showed a brief clip. Ed Sullivan was unexpectedly watching.

e0g5b TIL the word "daily" in the Lord's Prayer ("our daily bread") translates from the ancient Greek word "epiousios," which appears twice in the New Testament and nowhere else in any known ancient Greek text. We're not 100% sure of its meaning-some say it means "necessary" or "for the future" instead.
0wQnR TIL in 2003 some largely unkown online poker player came out of nowhere to win the 2003 World Series of Poker and win 2.5$. His real name was 'Christopher Moneymaker.' His win was said to revolutionize poker, and caused a great boom in popularity, called 'The Moneymaker Effect'
PYKag TIL that Metallica was the first band to perform on all seven continents by performing live and un-amplified (to protect the environment) in Antarctica.
RrP8 TIL that Ancient Greek scientist Eratosthenes used nothing more than shadows, geometry, and a dude he hired to pace out the distance between two cities to determine that the earth was curved, and roughly 40 thousand kilometers in circumference, and he was right.
xVgrg TIL the Demon core, a fissile core that went supercritical twice in the 1940s causing the deaths of Harry Daghlian and Louis Slotin.