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TIL that in 1931, Gödel, a 25 year old mathematician, showed that there is a gaping hole at the bottom of mathematics. Simply put, there are things that are true that mathematics can never prove to be true.

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GY7nJ TIL: (1906) Long after slavery was abolished there was a caged african man and monkey on display in the Bronx Zoo. Ota Benga later on committed suicide.
4kaQ6 TIL most U.S. states have a state fossil, with the first two officially designated in 1967.
kJAmg TIL in 1984 three hippos died in a West German zoo after an elephant opened a valve and sent hot water into their pool, generating steam that suffocated them.
1aNb4 TIL: While Hepatitis B shots are a federal requirement for school children, Hepatitis A shots are left to the states to decide. Hepatitis A has the more common outbreaks when someone is infected doesn't wash their hands and then handles food or surfaces.
4keBX TIL of Peter Buxtun, a Public Health Service epidemiologist, exposed the Tuskegee Syphilis Experiment by filing two protests with his superiors. His actions led to the story making the front page of The New York Times the following day and prompted the call for congressional hearings.