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TIL A full-time nurse named Marie Van Brittan Brown and her husband Albert invented the first home security system in 1966. She was inspired to do so because she saw how long it would take the police to arrive in her neighborhood after a crime was reported.

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nWr69 TIL Stanford engineers made a folding origami microscope that costs less than $1 to make. 50,000 microscopes were shipped to 130 countries in 2014 to see what people will do with it
Xkr TIL: There is a disorder, Williams Syndrome, where sufferers will befriend anyone.
5VeYr TIL Kowloon Walled City was notorious for drugs and crime but many of its 50,000 residents lived their lives peacefully until it was demolished in the early 90s
VB6PG TIL Song Dynasty created paper money to match its booming economy and also drove it off the cliff with hyperinflation
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