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TIL William Wrigley, founder of Wrigley’s Gum, invented direct mail marketing. In 1915 he mailed a pack of gum to every person in the phone directory in the United States.

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LQMGv TIL New York City implemented a bird-killing program to reduce bird strikes at LaGuardia Airport. Over 70,000 birds have been culled since Flight 1549's ditching in the Hudson River in 2009.
nWrPB TIL astronomers actually use lasers to project fake stars into the atmosphere, in order to measure & compensate for atmospheric distortions, allowing them a much clearer image of real stars.
J1po1 TIL In 1982 a video game called Custer's Revenge was released for the Atari 2600. Gameplay included the main character General George Custer, sporting a visible erection, attempting to find and "abuse" a native woman tied to a pole.
JYy8Q TIL that Dwayne "The Rock" Johnson was Tim Burton's second choice to portray Willy Wonka in Charlie and the Chocolate Factory (2005) as a backup in case Johnny Depp wasn't available.
yV7Zw TIL you are supposed to use a new section of floss for each tooth (not one string of floss for the entire mouth)