› added 10 years ago

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TIL spider web silk was once used for crosshairs in rifles.

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dk8d TIL that it’s illegal to pee in an elevator in Singapore, and that some elevators have a Urine Detection Device which detects urine odors, sets off an alarm, and close the elevator doors until the police arrive
VMmYm TIL a musician, Sivu, who did his entire music video in an MRI machine.
r6Wd TIL in 1942 the Canadians and British Navy launched a practice invasion of France, the Dieppe raid, they lost 20% killed, 10% wounded, 30% captured. The lessons learned in that disaster lead to D-Days success.
MAxK TIL Mount Everest is growing by 2.5 inches per year
VMWd4 TIL The Toba Catastrophe Theory contends that the eruption of the Toba supervolcano 75,000 years ago nearly made humans go extinct, reducing global population to somewhere between 2,000 and 20,000 people.