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TIL that Michigan has a reservoir that works as a giant battery. It pumps up water from Lake Michigan at night using off peak power. When there is high electrical demand the water is released to produce hydroelectric power.

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via reddit.com

rPNe TIL that the alien language featured in Futurama was completely deciphered by fans only a few hours after the pilot episode finished airing
dD5mE TIL of Sun Yaoting, the last eunuch of China who had his penis and testicles removed at the age of eight. Less than two years before China abolish the monarchy.
YJ4A TIL C.W. Post (founder of Post cereals) suffered several mental breakdowns. His doctor’s name? John Harvey Kellogg, inventor of corn flakes.
Ng06 TIL That Alexandre Dumas was black, and suffered at the hands of racism for most of his life, yet still was celebrated as France’s most widely read writer having written ‘The Three Musketeers’ and 'The Count of Monte Cristo’.
R5ab9 TIL about Effective Altuism. Effective altruism (EA) is a philosophical and social movement that advocates "using evidence and reason to figure out how to benefit others as much as possible". Popular priorities with EA include global health and to the survival of humanity over the long-term future.