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TIL The Story of Sengol: From Nehru to Modi, the Historic Sceptre of Tamil Nadu

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Y7Old Today I learned that Germany still uncovers 2000 tons of unexploded bombs from WWII every year. Disposing of the bombs often requires the evacuation of tens of thousand of residents from their homes.
R79gw TIL the Japan Times ran an article in 2010 predicting (seemingly accurately) the rise in popularity of thick thighs
QN4QE TIL that Sea Urchins are called Sea Urchins because Hedgehogs used to be called Urchins until about the 15th century. Sea Urchins are Ocean Hedgehogs.
1aMQP TIL that Vermont was it's own independent country with it own coinage and postal service for 14 years before being admitted into the Union. Even though they took part in the Revolutionary war, they were not part of the original 13 colonies due to a border dispute with New York.
R55w6 TIL how trains turn, without a differential. The wheels should create massive friction under the heavy loads. It is solved by conical wheels.