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TIL The famous groundhog, Punxsutawney Phil’s, official name is “Punxsutawney Phil, Seer of Seers, Sage of Sages, Prognosticator of Prognosticators, and Weather Prophet Extraordinary.”

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xdgg TIL Over 4500 missiles were fired at the SR-71 over 25 years without a hit
QNxmk TIL about "Man Engines" which were moving ladders that constantly moved up and down about 10 feet and used to move miners from 1000 ft deep mine shafts by stepping on and off the ladder step at the top of the up stroke, then stepping onto the next step on the down stroke (animation in link)
w1E8 TIL that mathematician John Edmund Kerrich passed his time in Nazi captivity by flipping a coin 10,000 times. The total percentage of heads and tails flips varied wildly at first but gradually converged around 50/50, providing a demonstration of the Law of Large Numbers.
YpANB TIL of Castle Infinity, a video game that was shut down in 2000 but was brought back when the servers were recovered from a dumpster by a former player and programmer, who established a new development team and relaunched the game online.
7r7Lp TIL in 1665 the Derbyshire village of Eyam made the remarkable decision to quarantine itself in an attempt to halt the spread of the Great Plague. 260 from 76 different families died, but the plague didn't reach the nearby towns of Sheffield and Bakewell