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TIL in 1981 a man named Roger Fischer had an idea for a volunteer to have ICBM launch codes put in their chest cavity. In the event of an emergency, the volunteer would carry a knife to be killed with. It was meant to force the personal killing of one man to start the impersonal killing of millions.

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XVVk TIL cats, unlike dogs, cannot (for physiologically reasons resulting in blindness & death) be vegetarian
Lbyr TIL that Olympus Mons is the largest volcano in the solar system. This Martian volcano is three times as tall as Mt. Everest and an observer near the summit would be unaware of standing on a high mountain, as the slope of the volcano would extend beyond the horizon.
LkB80 TIL in the movie The Godfather, the horse head from the scene where Jack Woltz, played by John Marley, wakes up to find it lying in his bed, is from an actual dead horse. During rehearsals a fake one was used, and Marley wasn't told beforehand, so his screams during the actual shot were genuine.
LkxEp TIL Jamie Hyneman and Adam Savage created a combat robot. In its first two tournaments, they were asked to withdraw in exchange for co-champion status. In the first it had slung pieces of its opponents into the audience. In the second these pieces damaged the walls specifically improved for it.
X0OBD TIL of Madam C. J. Walker, the first self-made female millionaire in America. Born in 1867, orphaned at 7 years old and widowed at 20, she made her fortune manufacturing cosmetics and hair care products