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TIL that “chemical imbalance” as a cause of depression is overly simplified, and “researchers believe that — more important than levels of specific brain chemicals — nerve cell connections, nerve cell growth, and the functioning of nerve circuits have a major impact on depression.”

eGE5 TIL that the Chinese city of Guangzhou had no subway whatsoever 20 years ago. Today, its subway system has 186 stations and is 191 miles/307 km long. It is today the world’s fourth busiest metro system, beating New York’s, London’s, Moscow’s and Paris’ in terms of ridership.
oBmDA TIL in 1899, Denver journalists wrote a fake story that China was tearing down the Great Wall. To their surprise it was picked up by a major newspaper with "confirmation" from officials and illustrations of the wall being torn down. The hoax spread across the U.S. and Europe without being debunked.
xV4X5 TIL the Lakota Indian known as Curly had a vision that he would be protected in battle. When he was subsequently wounded he realised the vision hadn't shown scalping, so he never scalped again. He went on to be known as Crazy Horse and helped defeat Custer at Little Big Horn.
6MeY TIL that American English likely has more in common with Shakespearean English than modern British English does.
yVVKl TIL after the death of Charles H. Coolidge in April 6th, 2021, Hershel "Woody" Williams is the last surviving Medal of Honor recipient of world war 2. He is a Marine and was flamethrower operator during the battle of Iwa Jima.