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TIL According to the International Olympic Committee, gold and silver medals are required to be at least 92.5% silver. The gold in gold medals is in the plating outside and consist of at least 6 grams of pure gold. Silver medals are made of pure silver, while bronze medals are 95% copper and 5% zinc

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Br4wy TIL Nim Chimpsky was a chimpanzee raised like a human child by a surrogate family as part of a controversial project on animal language acquisition. During his lifetime, Nim learned over 125 signs, including "stone smoke time now" which Nim used when he wanted to smoke marijuana.
VL68 TIL Women’s flapper fashion of the 1920’s valued small breasts and a thin boyish figure. Bras to flatten the chest were wildly popular
PYWwg TIL that the song "I've danced with a man, who's danced with a girl, who's danced with the Prince of Wales" was inspired by Edna Deane being asked for a dance nine times by the future Edward VIII.
0wPx5 TIL 'Hello' as a greeting is credited to Thomas Edison. Hello likely derived from hullo, a expression of surprise, but was seen by Edison as good greeting for telephone conversations. Alexander Graham Bell initially used Ahoy (as used on ships) as a telephone greeting, but it didn't take off.
WkN4Y TIL the oldest remains to ever be found in North America are those of a teenage girl in Mexico from 13,000 years ago.