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TIL Hydrogen bombs usually do not contain hydrogen because it is difficult to store. They instead use lithium that is split into hydrogen by an atomic bomb. It worked so well that the first bomb went off with 3 times the expected yield, set the world record, and still holds the US record for yield.

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BrG8e TIL that the character of Captain Ron, played by Kurt Russell, in the 1992 comedy of the same name was based off a real Captain Ron and trip the screenplay writer took with his family from Florida to Texas in 1969.
njpB TIL: In 1998 NASA grew Insulin in space. Researchers found that it was so effective it could reduce Insulin intake from 1-3 times per day to once every 3 days.
JmM4 TIL the Stanley Cup has been awarded 109 times, but only 5 times to a non-Canadian Captain
7bPL TIL that three teenage boys posed as young girls online, luring men into clandestine meetings. The boys then confronted the men at the meeting spot dressed as Batman and the Flash whilst filming the whole thing
N755P TIL the giant crystal cave in Mexico, with crystals weighing up to 50 tonnes, had an average of 100% humidity and 58° C temperature. This meant that the coldest place in the cave was the lungs, so water would condense in it and exposure for over 10 minutes would lead to death by drowning.