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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.

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9YM8p TIL Alabama has a higher human development index than Italy - if Alabama were a country it would rank as 28th most developed in the world, contrary to its reputation as an undeveloped region of the United States.
VNlZ TIL that it is almost certain that the astronauts survived the initial Challenger explosion, and died on impact with the water. At least three of the crew’s emergency oxygen tanks were manually switched on after the crew’s capsule broke apart from the rest of the shuttle.
NX8EM TIL the brown bear has been recorded to consume the greatest variety of foods of any bear. This is illustrated in the US, as meat made up 51% of the average diet for Yellowstone grizzlies, while it only made up 11% of the diet for grizzlies from Glacier National Park a few hundred miles to the north
1aLWd TIL I learned that the slang words crap or crapper did not come from Thomas Crapper, a toilet pioneer.
4XVnJ TIL that the "Wa" in Wario and Waluigi isn't an upturned M, it's actually a portmanteau of Mario and Luigi's name and the Japanese adjective warui which means "bad", literally translating to "bad Mario" or "bad Luigi".