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TIL: The longest a Great White Shark has lived in captivity is 44 days.

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9Yag7 TIL to defend a South African city under siege in 1899, a mining engineer from Detroit built a 155' high watchtower with search lights and telephones, a water supply system, a bulk refrigeration plant, two armored trains, artillery shells, a cannon, and also the tools needed to build the cannon
R7ro6 TIL: If the human eye could view all wavelengths of radiation, Betelgeuse would be the brightest star in the night sky
j6Vma TIL Robert Kajuga, leader of the Interahamwe, had a Tutsi father
oBZE8 TIL that Jim O'Heir (Jerry Gergich on Parks and Recreation) originally auditioned for the role of Ron Swanson.
KOlb6 TIL of Fallen Astronaut - a small aluminum sculpture of an astronaut. The sculpture was authorized to be brought on board Apollo 15, but astronaut David Scott placed it on the moon as a memorial to American and Soviet casualties of their respective space programs.