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TIL a mathematician tried for 7 years to prove that one cannot untie a knot on a 4-sphere. Then one day he decided to try to prove the opposite, and he succeeded in a few hours.

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P10GE TIL Unlike the majority of the US, Delaware was once a Swedish colony called New Sweden, established during the Thirty Years' War. Settlements were established in present-day Delaware, New Jersey, Maryland, and Pennsylvania. New Sweden existed from 1638 to 1655 before being conquered by the Dutch
VBkgk TIL Spc. Sean Baker was nearly beaten to death during a training exercise at Gitmo where he played the role of a detainee. Despite using the codeword and identifying himself, the beating only stopped when his jumpsuit ripped revealing fatigues
LQR8Z TIL the greatest loss of life in the history of helicopter aviation, was during the Second Chechen War in 2002, when a Russian Mi-26 transport helicopter was shot down and crash landed in a minefield, ultimately killing 127 of the 142 soldiers onboard.
1a4ad TIL pistol shrimp have a specialized claw that shuts to create a cavitation bubble that can kill small fish and these bubbles can reach temperatures over 8,000k which is hotter than the surface of the sun.
dDJer TIL Marcy Borders, a 28-year-old employee in the World Trade Center, survived the building’s collapse on September 11, 2001. Her picture, showed her completely covered in dust. The image became widely recognized, and Borders became known as "The Dust Lady." She passed away from cancer on 08/24/2015.