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TIL that the word boner also means 'careless mistake' and was used mainly with that meaning in the past

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94RB TIL that cheetahs were almost wiped out by the last ice-age, and all modern cheetahs are descended from a small portion of the surviving cats that interbred to maintain their species. Because of this, cheetahs are practically genetic clones of one another.
6kRQ TIL - 100% of Iceland’s population has the internet, the only country in the world.
mxN0P TIL - Most of the smoke billowing up from a space shuttle launch is not exhaust. It is water vapor from the pool of water under the shuttle designed to absorb the acoustic shock waves that could otherwise tear the shuttle apart.
B9rL TIL Historians believe the fate of Christianity hinged on the Battle of Tours where an Arab invasion force was defeated by a Frankish force in present-day France, preventing the spread of Islam to all of Western Europe and preserving Christianity as the religion of Europe.
4kReb TIL that Richard Mulcaster (1531-1611) established both our core modern English spelling rules, and core football rules like positions and coaches.