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TIL The man who invented the revolving door hated holding doors open for women.

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Z8leG TIL the legend of Isidas, a Spartan hero who was praised for defending his home but punished for risking his life as he didn't don his armour and thus needlessly risked the life of a Spartan. (Plutarch, Aelianus)
VMKrZ TIL the US government had a program to track infectious viruses that may jump from animals to people, but it was shut down in 2019. It had found 1000 novel viruses.
XElbQ TIL In May 1953, scientists in the British Ministry of Defence tested the nerve-gas sarin on the 20-year-old Ronald Maddison, who had unwittingly volunteered for the experiment thinking it would involve some very minor tests.
W7o8B TIL Christiaan Huygens was one of the first astronomers to apply mathematical principles to the design of optics rather than trial and error, and his telescope could study Saturn's ring system. The Huygenian eyepiece he invented in the 17th century is still in use today
Jayk TIL Samuel Johnson, an Englishman, said regarding the American colonies during the Revolutionary War, “How is it that we hear the loudest yelps for liberty among the drivers of negroes?”