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TIL that a rollover error in a radiotherapy machine’s computer system meant the sufficient checks were not ran before the machine delivered the dosage. Several people were delivered upwards of 80,000 rads and subsequently died from the overdose.

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GAX95 TIL During WW2, the American military went from 2,500 planes to over 300,000 aircraft used by the end of the war
ZxoG TIL that “America’s public school teachers almost uniformly now come from the bottom 25 percent of their college classes.”
QJVoa TIL that North Koreans are especially proud of Kim Jong Il for his "inventions". One of them is the Gogigyeopbbang or double breaded meat, which is essentially a hamburger.
lo9vB TIL that children (and adults) in the US were tattooed with their ABO Blood group and Rhesus factor(Rh) by schools in the 1950s. With Cold War at its peak, children were included in this program to cover potential shortages in blood banks in case of a Soviet Union attack.
Y7plP TIL that during World War II, USAAF Col. Paul Tibbetts was frustrated with his pilots complaining about how hard it was to fly the new B-29 bomber. He arranged for two women WASP pilots to be trained on the big plane and had them fly it around the country just to shame the men. It worked.