TIL a Challenger space shuttle engineer, Allan McDonald, raised safety concerns against the wishes of his employer & NASA. He was ignored; a fatal accident resulted. When McDonald spoke out, he was demoted by his company. Congress stepped in to help him. He later taught ethical decision making. [source, comments]

TIL The largest airline food poisoning incident occurred on Japan Airlines en route to Denmark after 197 fell ill from infected omelettes. Due to limited Japanese/Danish translators, Japanese speaking restaurant staff were recruited from Copenhagen to serve as medical translators [source, comments]

TIL after a Polish Admiral of German descent Józef Unrug was taken prisoner during WW2, his former Imperial German Navy friends came to visit him. Unrug refused to speak German with them, saying that he had forgotten that language in September 1939 the day Germany invaded Poland
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TIL for the most part, English witches were hanged while French ones were burned. This posed a riddle for the Channel island of Guernsey when three witches turned up there in 1617. Ultimately, they were hanged according to British law, then burned according to French ? [source, comments]