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TIL the first streaming service was created in 1881. Théâtrophone let subscribers listen to opera and theater over their telephone lines.

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XEdZ6 TIL That there is a distinct variety of mosquito that's evolved to live in the London Underground - unlike its above-ground counterpart, it doesn't hibernate and feeds mostly on human blood, rather than bird
yVXLM TIL that a few hours before their flight, cosmonauts are spun on swivel chairs, tilted on special beds, and deliberately disoriented to prepare for zero-G, especially to handle space sickness caused by leaving the planet
Amgw TIL: “Generational Curses” may be a real thing. There was a study where mice were given a small shock to the foot at the same time as the smell of acetophenone. After 10 days, they mated. The children mice inherited a fear of the odor even though they had never been exposed to it before.
grXoX TIL that there is a German man named Marc Wubbenhorst who must drink 20 liters of water every day in order to not die from dehydration. He suffers an extreme case of diabetes insipidus.
4kbRb TIL that a nuclear worker in Japan was exposed to 17 Sieverts of radiation (twice the amount that should kill a person). He was kept alive for 83 days, suffering serious radiation burns to his body, severe organ failure, and an almost zero white blood cell count.