› added 10 years ago

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TIL- Halley’s Comet has two correct pronunciations. It can rhyme with “daily” or “valley” since the discoverer, Edmond Halley, spelled his name 6 different ways during his lifetime.

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0waXL TIL that airplanes at high cruising altitudes (20-30K+ft/6-9k+m), despite going slower than the speed of sound (~767mph/1238km/h) are technically flying supersonic. That's because the speed of sound decreases with pressure and pressure drops with altitude.
0JKR TIL that one of the first scientists to discover nitrous oxide completely missed its use as an anesthetic because he ended up just using it to get high (having first experimented on it to see if it could cure hangovers)
EgDyx TIL that in 2013, Chinese doctors have saved a man's severed hand by grafting it to his ankle
oRJPW TIL that people who attempted suicide are seven times more likely to die from heart disease before age 40
4P45 TIL The outdoor clothing company ‘Patagonia’ use plastic bottles to create polyester fleece garments and are a leading manufacturer in transforming trash into fleece, decreasing their dependence on petrol