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TIL The design of carburetors in British WWII fighter aircraft had a fault that would shut down the aircraft's engine during a negative-G force maneuver. In 1941 a female engineer solved the problem with a simple device, which British pilots then named after her. It was named Miss Shilling's orifice

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JY8o1 TIL that Photorhabdus luminescens, a bioluminescent bacterium, reportedly infected the wounds of some American Civil War soldiers. This both caused the wounds to glow and helped the soldiers to survive due to antibiotics made by the bacterium. This phenomenon was named "Angel's Glow".
XEvKX TIL The true meaning of 'Aloha' in Hawaiian is love, peace and compassion. The literal translation of Aloha from Hawaiian to English is “the presence of breath”. “Alo” is a Hawaiian word for presence and “ha” means “breath”.
AvN7 TIL of Argos, Odysseus’s dog in the works of Homer. After 20 years of waiting for Odysseus to return home, the dog is the only one to recognize him, he wags his tail and Odysseus sheds a tear, and Argos dies after meeting him one last time.
oRBBY TIL that a video game composer snuck a subliminal message to try and deter pirates with a faint message repeated in the intro song : "You will not copy this game."
PYjXn TIL that Skylab, the American space station of the 1970s, was initially stocked with 420 towels.