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TIL about the submarine USS Chopper, which in 1969 suffered an electrical failure while diving, causing it to point nearly vertically down and almost approach crushing depth. During the crew's efforts to regain control, the submarine eventually shot up nose up, nearly completely out of the water.

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oGv7 TIL; Google created a kill switch in case it’s A.I. project “DeepMind”, in case it attempts to resist human modifications to it’s learning or tries to create it’s own orders.
mxlMy TIL a Japanese submarine was sunk in WW2 because American sailors were throwing potatoes at it
g5dW TIL that mushrooms are more closely related to humans than they are to plants
yxZw TIL that Australia uses the motion of the ocean to generate zero-emission electricity and desalinate water simultaneously
5Ved8 TIL about the Goiânia accident, the worst nuclear disaster in Latin America’s history. A mysterious canister containing blue powder was found in a junkyard and passed through a family, resulting in 249 severely contaminated people and 4 deaths, one being a 6 year old girl.