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TIL between 1949 - '69 the US Army conducted 239 open-air tests of biological agents on unknowing US civilians in San Francisco, New York, Washington DC, Key West and more. In 80 of those experiments the Army said it used live bacteria.

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nW4PG TIL about John Williams, the oldest MMA fighter, who participated in and won 1 fight at 70 years old. He also achieved over 100 weightlifting records, a world record for breaking 10 blocks of ice with a single punch, and could perform 13 consecutive hours of judo throws.
N7a71 TIL Fortunate turns of weather saved the Japanese town of Kokura from the atomic bomb, twice.
EG6W TIL Dinosaurs were neither warm nor cold-blooded, instead “mesothermic” or in between
PWyZ TIL the first historical document containing the @ symbol was a wheat shipment from Castile to Aragon in the year 1448.
GYlx5 TIL flight hijacking from the USA to Cuba during the 60s/70s was so common, pilots were equipt with detour flight plans and building a fake "Havana airport" in south Florida was seriously considered