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TIL the first detective in the Chicago Police Department was Alan Pinkerton.

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VMW70 TIL that upon joining Black Sabbath in 1979, Ronnie James Dio began using the sign of the horns. The previous singer in the band, Ozzy Osbourne, was rather well known for using the "peace" sign. Dio, not wanting to copy Osbourne, chose to use the sign his grandmother always made.
7m9r TIL that shards of obsidian, or volcanic glass, can be refined to have a cutting edge only 3 nanometers thick. This is over 1300 times thinner than some scalpels.
wLP6M TIL: Grand Theft Auto V broke industry sales records and became the fastest-selling entertainment product in history, earning $800 million in its first day and $1 billion in its first three days.
p8OOA TIL David Spade inspired Donkey. Terry Rossio and Ted Elliot, who wrote Shrek, said, ‘You know who we patterned the donkey and the ogre off of? As far as their relationship? That was Spade and Farley in Tommy Boy.'
Qr1p TIL that the Nazis resurrected an extinct breed of cow that was so aggressive it tried to kill anyone that got near it.