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TIL that in 2011 the head of the American College of Surgeons was forced to resign after he wrote a Valentine’s Day editorial touting the mood-enhancing effects of semen on women during unprotected sex, which was completely supported by the research he cited in said editorial.

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wLkl8 TIL Cancer death rates have dropped 26% since 1991, with many major forms reduced by 39 to 52%. This has saved nearly 2.4 million lives.
5YevR TIL On September 8, 2009, Sgt. Dakota Meyer disobeyed a direct order to pull back from his position so he could rescue wounded soldiers from a firefight a mile away. He ended up going back five times, saving the lives of 36 soldiers, saying “That’s what you do for a brother”.
Zbnv TIL New York Subway trains have been running for 24 hours a day since it began operation in 1904
9YXJp TIL during the 60’s at a Nevada test site, Billy Waugh and a small team successfully parachuted in nuclear bomb parts, assembled it, and had it ready to arm in 14 minutes. (This tactic would later be considered for use during Vietnam conflict.)
OooN1 Physics has the answer.