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TIL that in 1964, three physicists who just got their PhDs were tasked with developing a working design for a nuclear weapon using only unclassified information. The goal is to see if a country can develop a nuclear weapon without aid. They accomplished it within 2 and a half years.

Read more atomicheritage.org

via reddit.com

D15ep TIL that in most Hollywood movies any scene involving an animal is monitored by the Humane Society to ensure no animals are actually harmed in the making of the film.
JYPB8 TIL that 6 out 7 women Hitler dated in his adult life died by sucicide or attempted suicide. BONUS: Hitler would carry a whip around in an attempt to "impress" women as well.
mx5Wo TIL of Andy—a footless goose born in the 1980s who walked around in baby shoes. He rapidly became a huge star and appeared all over the media, before he was murdered in 1991. His death sparked a nation-wide outrage and a $10,000 reward for information about his killer, but the case was never solved.
1aOYV TIL that the United States firebombed (i.e., dropped incendiary bombs on) not one, not two, but SIXTY-SEVEN cities in Japan during World War II. This list doesn't include the A-bombing of Hiroshima and Nagasaki.
JYNe1 TIL Alan Rickman was originally offered to voice Lord Farquaad in Shrek but he turned it down to play Severus Snape