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Til an earthquake can have a negative magnitude

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9YA9p TIL of Hannah Senesh, a Jewish paratrooper and poet during the Holocaust. She was captured, tortured, and eventually executed, but never gave up her comrades. "I could have been twenty-three next July; I gambled on what mattered most, the dice were cast. I lost."
PY5dZ TIL that the Unabomber, Ted Kaczynski, was arrested in part because of his use of the phrase "You can't eat your cake and have it, too." The odd phrasing showed up in both his manifesto and his personal letters.
Br9oK TIL Stephen Hawking once threw a cocktail party for time travelers, only sending out invitations afterwards. Nobody showed up.
p8glp TIL that the Egyptian pyramids are not in the middle of the desert and just 200 meters away from the nearest neighborhood of Cairo. There even is a golf course near the foot of the Cheops pyramid.
yQ8DX TIL that "Hark, the Herald Angels Sing" was never meant to be a Christmas carol. The music was originally written for the 400th anniversary of the printing press.