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TIL In Western music, microtones are notes that deviate from the standard 12-note scale. These are the notes that can sound "flat" or "sharp" compared to the notes in the 12-note scale, like the "out-of-tune piano" part in the Beatles’ “Rocky Raccoon.”

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P1nVO TIL you can have a negative magnitude earthquake. Magnitude calcs are based on logarithmic scale so a ten-fold drop in amplitude decreases the magnitude by 1. If an amplitude of 20 mm as measured on seismic signal corresponds to a magnitude 2 earthquake then 1000 times less (0.02 mm) is mag -1.
xWEk TIL the kings in the 4 card suits supposedly represent great rulers in history. The king of spades is David, king of Israel; the king of clubs is Alexander the Great, king of Macedonia; the king of hearts is the French king Charlemagne; and the king of diamonds is the Roman Caesar Augustus.
Lkwep TIL that the Milgram Experiment, in which participants believed they were shocking people, was flawed. Many suspected that the shocks were fake. Subjects who thought they were truly shocking others were much more likely to defy the experimenter and refuse to proceed.
VBmKB TIL Redbox is owned by Chicken Soup for the Soul, publishers of the inspirational book series of the same name
y6Yp TIL that the world’s oldest known complaint letter was written to a Sumerian copper merchant named Ea-Nasir almost 4000 years ago on a clay tablet: “You put ingots which were not good before my messenger and said: ‘If you want to take them, take them; if you do not want to take them, go away!’”