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TIL that the spellings "per cent" and "percent" are both correct, the difference is that "per cent" is used mainly in Britain and Canada, whereas "percent" is most preferred in the US

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R74j1 TIL: Out of respect for David Letterman, Conan O'Brien urges his audience to switch the channel and watch the final Late Show with David Letterman instead.
d8wN7 TIL that a British inventor created an earthquake bomb, which was used in WWII to great effect to destroy bomb-proof installations such as submarine pens. The same inventor later invented a bouncing bomb, which would skip across water to avoid torpedo nets and destroy dams
QNgBE TIL in 1898 Nikola Tesla experimented a small steam-powered mechanical oscillator that could produce earthquake-like effects
rO1e TIL Paintball guns, before the game was invented, were used to mark cows ready for slaughter and trees ready to be cut down
D1DDV TIL Sir Patrick Stewart and Hugh Jackman hold the Guinness World Record for "longest career as a live-action Marvel superhero"