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TIL half of American adults are in a law enforcement face recognition network. Its use is almost completely unregulated, as most agencies don’t even require suspicion of criminal activity before using the database for identification.

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GY4LE TIL: Petrus Plancius, in 1612 created the Unicorn Constellation (Monoceros Unicornis) to fill the empty area between two large constellations, Orion and Hydra.
JB68 TIL An Indian man whose wife died when medical attention could not reach her, carved a 360ft long path through a mountain to cut the time it took for medical assistance to arrive at his village. It took him 22 years and shorted the journey from the nearest town to 1Km, from 75Km
EJ0w TIL Jimmy Wales founded a porn site in order to acquire the initial funding to create Wikipedia.
yaRe TIL that Japanese anti-crime paintball was inspired by toll-booth attendants throwing raw eggs at toll-evaders that charged through without paying their tolls. While the police appreciated this effort to mark nonpayers, they felt it was inappropriate to use food for the purpose.
PYNoZ TIL that the north and south portions of the Great Salt Lake in Utah are two separate colors. This is due to a railroad causeway disrupting the natural mixing of the lake's water resulting in part of the lake being saltier and promoting the growth of different types of algae.