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TIL an analysis of dozens of ancient civilizations revealed that they only had an average lifespan of 340 years before reverting to a more primitive state, being absorbed into a stronger society, or disappearing completely.

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9wZ4Q TIL that on May 17, 1947 at Fenway Park a 3lb smelt fell out of the sky and hit Red Sox pitcher Ellis Kinder in the head
E149V TIL that approximately 300 people live in the tunnels under Las Vegas in order to do drugs or be alone in general.
Wkk6o TIL President McKinley was reluctant to accept the security available to his office. His secretary feared an assassination attempt would take place during a visit to the Temple of Music (where McKinley was indeed assassinated) and took it off the schedule twice. McKinley restored it each time.
m1PNx TIL that Willie, a heroic parrot, saved a choking girl by alerting his owner, Megan Howard, who then performed the Heimlich maneuver and rescued her.
JYPW8 TIL it rains diamonds on Neptune and Uranus