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TIL the largest known Prime Number is 2^82,589,933− 1. It contains 24,862,048 digits, and a search for a potential larger Prime is ongoing.

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5gyB TIL Ray Bradbury wrote a short story where a time traveling safari hunter accidentally crushes a butterfly under his boot in the Cretaceous period, thereby changing the course of history millions of years later. He wrote the story two decades before the term “Butterfly Effect” first came into use.
neVKP TIL In the 1950s and 60s, a Montreal hospital subjected psychiatric patients to electroshocks, drug-induced sleep and huge doses of LSD on behalf of the CIA's pursuit of mind control. It was part of MK ultra
wEGP TIL that Tony Gonzalez saved a man’s life by colliding with him on the sidelines. The man had to get an MRI and found he had a brain tumor.
vV4K TIL a British TV show intercepted TV and Internet feeds, creating weeks of fake stories and programs from trusted sources, and staged a zombie apocalypse using hundreds of actors, just to convince one person the world was ending.
4XVr6 TIL that Lego bricks from 1958 still interlock with those made in the current time. Each Lego piece must be manufactured to an exacting degree of precision. When two pieces are engaged they must fit firmly, yet be easily disassembled.