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TIL that men produce a higher percentage of motile sperm in their ejaculates after viewing sexually explicit images of two men and one woman (a sperm competition risk) than after viewing sexually explicit images of three women, likely indicating a response to an active risk of sperm competition.

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9YZ66 TIL of Justine Sacco who before a flight to South Africa in 2013 tweeted to her 170 followers "Going to Africa. Hope I don't get AIDS. Just Kidding. I'm white!" By the time she landed she was the number one trending topic in the world and had been fired
QBZE TIL that since Paul G. Lind of Portland, Oregon, loved to play Scrabble so much, his family and friends decided to have a Scrabble-themed tombstone made just for him when he died in 2005.
kOgBg TIL of "The Thing", a listening device designed by the guy who invented the theremin, disguised as a gift from the Soviets to the US ambassador to spy on the US.
dZMB TIL that Buzz Aldrin claimed travel expenses for his journey with Apollo 11. They paid $ 33.31
rRLx4 TIL screenwriter Shane Black (Lethal Weapon, Iron Man 3) is known for obnoxiously breaking the 4th wall in his scripts. An example is when he describes a house as "the kind of house that I'll buy if this movie is a huge hit". These quips have become to be known as "Shane Blackisms" in the industry.