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TIL When you open your eyes in a prefectly dark room you don't see black, but " eigengrau ", a shafe of grey

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LgAP TIL the English language has a mark resembling an umlaut (called a diaeresis) used to show 2 vowels are also 2 syllables, as in coöperation. The mark is mostly defunct, but still used by The New Yorker magazine.
4Pa TIL an 8yo boy wrote to Lego asking how he could get a job with them, then followed their instructions and now, aged 23, is a Lego Designer.
d80LB TIL To treat a malaria outbreak in Borneo, the WHO used DDT to kill mosquitoes. DDT killed wasps which were eating thatch-eating caterpillars who were eaten by geckoes & eaten by cats, who died, which led to rats, plague, & typhus. WHO had to parachute 145,000 cats into the area to kill the rats.
BrZ7W TIL that in London in 1814, a vat at the Horse Shoe Brewery ruptured unleashing 1,470,000 L of beer which poured down Tottenham Court Road in a 15ft wave destroying two houses, a pub, and killing at least 8 people
v9eL TIL a worm sent into space so that its regenerative powers in zero gravity could be studied grew a second head. When the heads are removed they grow back again.