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TIL the USA was feeding radioactive material to mentally disabled children, exposing U.S. soldiers and prisoners to high levels of radiation, irradiating the testicles of prisoners and exhuming bodies from graveyards to test them for radiation to understand the effects of radiation on the human body

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9wMBB TIL the Smithsonian Institution in Washington DC displayed a working "Little Boy" Atom Bomb that lacked only uranium until 1986. Then the Department of Energy took the bomb from the museum to remove its inner components, so it could not be stolen and detonated with fissile material.
WndY TIL that 71% of Americans are “fairly certain” that Alexander Hamilton is among their nation’s past presidents. This confidence in Hamilton having been president is higher than for six actual presidents.
P1aKE TIL that in 2018, the town of Mayo, Florida, temporarily changed its name to Miracle Whip
YpXgx TIL real Christmas trees are more environmentally friendly than artificial, despite the latter 'saving' a tree
rRD8e TIL that 'Karens' will always be 'Karens'