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TIL that 29% of San Francisco’s air pollution comes from China

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oB4o8 TIL 37% of games purchased on Steam are never played.
JYL44 TIL German alchemist Hennig Brand discovered phosphorus when he tried to make gold from urine
e0rQL TIL the term "shoddy" comes from the Civil War when in their rush for uniforms the Union bought ones made from a recycled wool product called shoddy. When it fell apart in rain or after a couple of weeks wear it quickly became synonymous among the troops with poor quality and workmanship.
d8Ra7 TIL the Aztecs followed Spaniards around with incense burners when they came to the Americas. The Spaniards believed this to be a divine honour, however it was actually a necessity due to the wide gap in hygiene between the two peoples. The Aztec found their stench unbearable.
p8lAN TIL in the "The Famous Five" books, published in 1942, there is a 11-year-old character named Georgina who is a tomboy and demands that people call her "George". She often gets cross when anyone calls her by her real name and loves it when somebody mistakes her for a boy.