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TIL during the 1950s and 1960s alone, the US government and military conducted experiments that included spraying sailors with sarin gas, releasing bacteria on the city of San Francisco, and feeding radioactive oatmeal to handicapped children.

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W7YwB TIL: According to Arms Control Association, 2056 nuclear test explosions have been performed around the world since 1945. 1962 was the most active year with a total of 178.
KYGm9 TIL the Chandra X-Ray Telescope captures X-ray photons at a calculated angle, using the same ancient technique as stone-skimming, otherwise the X-rays would pass straight through the mirror.
yQmQ8 Today i learned of the Gwangju Massacre of May 1980 in South Korea, where Gwangju citizens were massacred for wanting democracy, independence, and reunification
x6957 TIL Walmart sells guns in the US
X0alk TIL that a school principal once made a student who'd gotten into trouble sit in the basement & read the U.S. Constitution as punishment. That student (who committed the Constitution to memory as a result) was Thurgood Marshall, who went on to become the first Black Supreme Court justice