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TIL that Ancient Greek scientist Eratosthenes used nothing more than shadows, geometry, and a dude he hired to pace out the distance between two cities to determine that the earth was curved, and roughly 40 thousand kilometers in circumference, and he was right.

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Y7LRG TIL that the pound sign £ is a stylised L, from the Latin "libra pondo" (a Roman unit of weight). The reason why it's called a "pound sterling" was because it was originally defined as the value of a pound of sterling silver.
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