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TIL of genetic sexual attraction,where people with similar genes tend to be mutually attracted. This is often cancelled by the Westermarck effect:children raised together rarely become mutually attracted when older. Thus,separated siblings who reunite as adults have a high risk of sexual attraction.

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yQ7Je TIL that 'Song 2' by Blur was almost cut as it was a deliberately-basic song the band never took seriously, but record execs liked it when it was on the list of possible singles; the band never bothered to change the album's tracklist placeholder, and coincidentally is 2:02 in length
e0Gwg TIL of the 1980 book "Michelle Remembers", which sold millions of copies and spurred the Satanic panic of that era. Oprah even had the two authors on her show and presented their accounts of satanic abuse as pure fact. The book was later discredited.
wmOE TIL that playing action video games trains people to make the right decisions faster without loss of accuracy. Video game players develop a heightened sensitivity to what is going on around them, which helps with multitasking, driving, keeping track of friends in a crowd, and navigating around town.
E1mKp TIL that One of the Seven Wonders of the Middle Ages " Kom El Shoqafa Catacombs " was accidentally discovered in 1900 when a donkey was suddenly swallowed by the earth below.
9w8mr TIL “Scared Straight” interventions are ineffective and may in fact increase delinquency relative to no treatment at all