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TIL 90% of the world’s population lives on the northern hemisphere

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Bg88x TIL about the "Demon Core" a plutonium core of an atomic bomb designated to be the 3rd nuclear bomb dropped on Japan during WWII, but after Japan surrendered the core was used for research at Los Alamos National Labs in New Mexico where it was involved in two fatal accidents.
dDwd8 TIL About Hart Island. Located in Long Island Sound the island has seen many uses including as a POW camp, as an anti-aircraft missile battery site and a drug rehab facility. However it's primary fame is as NYC's Potter's Field with an estimated one million burials having taken place there.
R7Xoa TIL clothes hangers weren’t invented until the early 1900s. Before that people had fewer clothes and used shelves and hooks.
R5wbQ TIL according to US Census data, the state of New York in 2023 had both: the largest population decline in pure numbers (almost 102,000 residents) and the highest rate of population decline (0.5%) among all 50 states.
WkQvY TIL of a soviet engineer named Adolf Tolkachev who from 1979-1985, leaked soviet military secrets to the CIA which saved the United States hundreds of millions of dollars in military research. He was therefore dubbed "The Billion Dollar Spy."