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TIL Insulin shock therapy was used as treatment for schizophrenia. Scientists believed it could jolt the brain out of mental illness or induce the restoration of the normal function. In reality the treatment caused brain damage and a "loss of tension and hostility" that was viewed as therapeutic.

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vPE6K TIL: Pure water (distilled or deionized) is a poor conductor of electricity. It is the dissolved ions and contaminants that conduct electricity.
QZxM TIL: That there is an alternate timeline comics series in which Bruce Wayne is killed prompting his now insane mother to become a female Joker and his father to become a much darker and more violent Batman.
PYW8n TIL DC Comics published 7 different Supergirl series from 1972 to the present day. The release of the last issue of Supergirl in the first series was delayed for several months due to a nationwide paper shortage in 1974 and the 1994 edition was only 4 issues long
awd5J TIL Sloths only poop once a week, and when they do they lose up to 1/5th of their body weight. Pooping for sloths is also responsible for 50% of their deaths, as being down on the ground is a vulnerable time for them. Overall, the entire trip to poop uses 8% of their daily energy needs.
R5Rk6 TIL - An Italian man from Milan, Xu Xiangshun (his legal Chinese name) ended up in China's countryside when he was around 3 and pretty much adopted the full Chinese peasant lifestyle. He doesn't know any Italian or have a clue about its culture.