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TIL that when one hermit crab finds a bigger shell, a gang of them will sometimes form a “vacancy chain” in which they queue up from smallest to largest and all move one shell up.

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loP5a TIL the term "meritocracy" was coined by Michael Young in his 1958 dystopian essay "The Rise of the Meritocracy" to demonstrate the social dysfunctions he predicted arising in societies where the elites believe that they are successful entirely on the basis of merit.
xVlW7 TIL that during WWII, the large crosswelded metal beams that covered the beaches of Normandy on D-day are called Hemmbalken, and were supposed to wreck landing craft that were expected to attack during high tide. The Allies instead charged while exposed during low tide.
1alm8 TIL in the Hobbit movies, Smaug is guarding 16,646,250 metric tons of gold, and it would be worth approximately 676 trillion USD.
B7Yk TIL the first ever parking sign was from c. 700BC, Ancient Assyria, and read “ROYAL ROAD - LET NO MAN DECREASE IT”. The penalty was being impaled in front of your house.
D1w7v TIL Che Guevara's real name was Ernesto Guevara. He was nicknamed "Che" because he used the word "Che" (which means 'pal' or 'buddy') excessively while talking to people.