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TIL People recognize eyebrows more than they do actual eyes

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XEDwQ TIL scientists made a mouse utopia called Universe 25. It started with 4 males and 4 females, peaked at 2200 mice, then declined to extinction - the mice lost instinctual behavors. Humans now demonstrate similar traits.
9YDr6 TIL that "green cards" were not green from 1964 to 2010.
PO6V TIL during the dot com bubble in 1999, Mark Cuban was prevented from selling his Yahoo stocks due to a lock-up clause. So, he sold insurance against the share price rising, and used the profits to buy insurance in case the share price fell. In total it cost him nothing, and made him a billionaire.
BgkbD TIL the U.S. Constitution still permits Congress to authorize you to be a pirate.
BgpZk TIL they cut the eye stalks of shrimp.