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TIL: After shooting John Lennon outside of Lennon's home, his killer remained at the scene reading The Catcher in the Rye until he was arrested by the police.

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via reddit.com

j6Kxa TIL that the world's highest calibre handgun is the Pfeifer-Zeliska .600 Nitro Express Revolver, which fires a bullet that's 15,2 mm (0,62 inch) in diameter. The gun cost över $15 000 and each bullet costs $40.
yQDa TIL that “Uncle Sam” is an imitation of a British recruiting poster featuring Lord Kitchener.
GAv8G TIL sci fi author Jack Williamson coined the terms terraforming (1942), psionics (1952), and was one of the first people to use the term genetic engineering.
BMvk TIL FOX threatened to sue The Simpsons over a FOX News gag, but didn’t because they would have effectively been suing themselves
epyK4 TIL the characters "Perry the Platypus" and "Knuckles the Echidna" do represent the only two families in the monotremata order. Which means Platypus and Echidna are the only two families of egg-laying mammals on Earth.