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TIL the Therac 25, a computer controlled radiation therapy machine, killed six people as a result of a computer bug that allowed the machine to inject lethal doses of radiation into patients.

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wLRNY TIL about the Royal Hawaiian Navy, which consisted of a single ship, HHMS Kaimiloa, and existed for about 5 months, from March to August of 1887. She only had a single mission- to sail to Samoa to seek an alliance. That mission failed, mostly due to colonial ambitions of world powers at the time.
kOPp7 TIL most Japanese schools do not employ janitors. The Japanese education system believes that requiring students to clean the school themselves teaches respect, responsibility, and equality
e0Gng TIL that the biggest ship in the ancient world the Tessarakonteres had 4,000 oarsmen. Most believe that the boat was so big that it wasn’t really functional.
4Xpkb TIL that a British bomb detection dog named Theo died from stress a few hours after seeing his handler get shot. The pair had set a record for bomb detection, and the dog was posthumously awarded an honour equivalent to the Victoria Cross.
P60e TIL ‘medieval’ chastity belts are a myth