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TIL scientist feared the first atomic test would initiate an unstoppable chain reaction and ultimately lead to the destruction of earth

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QjjX TIL there are currently plans underway to have sex in space by 2016
WkK44 TIL that the first major wave of the bubonic plague was the Justinianic plague of 541-547 A.D. It is named after the Byzantine emperor at the time; Justinian I. The disease killed 20% of the imperial capital and the ensuing pandemic is believed to have killed 25%-60% of Europe's population.
vPlX4 TIL black day, contrast to Valentine’s Day and white day, is a day for single or people who has not got a gift on either days
a8Aw0 TIL Though commonly thought to be owned by no-one, 7 countries have made territorial claims to Antarctica, including Australia, UK, New Zealand, and France. The US does not acknowledge it.
lGAa TIL of ‘Code of the Secret Service’, a movie which lead actor Ronald Reagan called “the worst picture I ever made.” The film inspired a man named Jerry Sparr to join the Secret Service, who in 1981, saved President Ronald Reagan from an assassination attempt