› added 2 months ago

18

TIL the color purple doesn’t exist and is considered an illusion

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OKQ1 TIL the first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face
E1nJX TIL that the ancient Romans used concrete with volcanic ash mixed in, which allowed for much stronger crack-resistant concrete
XADR TIL Pirates used eye patches to quickly adjust their eyes from above to below deck, having one eye trained in bright light, and the other in dim light.
l7J9r TIL: the same man invented the Clean Room (CalTech), discovered the true age of the earth (4.5 billion), AND almost single-handedly got lead out of our gasoline and envirnoment. HERO: Clair Cameron Patterson
Wka8A TIL During the Vietnam War, an Army aviator scored an air-to-air kill by shooting down a MiG from his fixed-wing Mohawk observer aircraft. The kill was kept secret since U.S. military doctrine stated that the Air Force has sole control of air superiority.