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TIL the term "out of the blue" originates from lightning strikes out of the clear blue sky.

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4ke6R TIL Hawaii didn't have mosquitos until 1826
0dPR TIL a prisoner was kept in a 9x7 cell w/no light, clock, or calendar. If he left his cell, he was fitted with goggles and headphones. He started having tics and unusual contortions of his body. He became convinced his lawyers were part of an interrogation program and his captors were protectors.
dDEbj TIL the man often credited as the first person to synthesize heroin, Felix Hoffman, did so only 11 days after first synthesizing Aspirin while working for Bayer
Vw7p TIL the military word “mayday” meaning “emergency” comes from the identically pronounced French phrase “m'aidez”, meaning “help me”.
Oo791 TIL in the summer of 2018 a man who flunked the London paramedic exams managed to infiltrate the paramedics' internal computer system and pose as a qualified paramedic. As a result he managed to respond to over 100 emergency calls before he was caught.