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TIL CDs are 12cm because Sony knew that Philips had a factory capable of producing 11.5cm CDs so making 12cm industry standard would erase Philips' head start in manufacturing

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4XaQJ TIL That H. R. Giger's Name Is Pronounced Geegur Not Gaigur
GAJDE TIL that electric eels can deliver a shock of up to 600 volts, which is strong enough to stun a horse.
d8Rp9 TIL that American neurologist Walter Freeman drove around the US performing ice pick lobotomies in a van he coined the lobotomobile.
ADM0n TIL, that dolphins and whales don't drink sea water. They get water from the food they eat.
neYpY TIL that Emma of Normandy married both Æthelred the Unready, the King of the English, and Cnut the Great, the son of Sweyn Forkbeard who overthrew Æthelred. Her sons by each, Edward the Confessor and Harthacnut, each became king of England.