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TIL that in 526 AD there was a worldwide dust cloud that blocked out the sun for a FULL YEAR, resulting in widespread famine and disease. More than 80% of Scandinavia and parts of China starved to death, 30% of Europe died in epidemics.

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XEpm6 TIL 1 gram of uranium 235 has 19,870,900,000 calories and would take over 50 million hours of cycling to burn off.
E16Md TIL Marie Curie, the first woman to win a Nobel Prize, the first person to win twice, and the only person to win a Nobel Prize in two different sciences couldn't legally attend college, so she did it illegally, going to what was known as the 'Flying University', a secret organization.
78YMb TIL "Where In North Dakota Is Carmen Sandiego?" exists, developed by Broderbund and Minot Public Schools for the 1989 North Dakota Centennial. With 5,000 copies sold and only 3 known to have survived, it's considered "one of the rarest video games ever made."
OK5Y TIL Arnold Schwarzenegger secretly tricked Jesse Ventura into thinking he had bigger Biceps so that he could get him to bet a bottle of champagne when they measured
KO9B TIL that in 1987 some Brazilian thieves stole a radioactive medical device and opened it. Some people died, and hundreds were contaminated.