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TIL in 1859, the French government passed a law defining the frequency of musical notes, in the first move to standardize musical pitches.

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mxPNy TIL During WW1 the british army created “Pals Battalions” which let men fight alongside their friends, neighbours and colleagues. The objective of these battalions were so soldiers would fight harder and keep each others spirits up.
8vDL TIL that everyone in Iceland pays church tax, and the payment of those unaffiliated with a church goes to the University of Iceland [at least as of 2004]
BrvvW TIL the Pentagon was built in less than a year and a half and was only supposed to be temporary
mxB7y TIL in 1865, Charles Dickens was traveling home from France when his train derailed while crossing a bridge, and his car was left dangling from the tracks. He helped save stranded passengers and then climbed back into the dangling car to find a manuscript he was supposed to send to his publishers.
b6yYQ TIL that there are over 20,000 species of edible plants in the world, but only 20 make up 90% of humans' food.