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TIL of incense clocks that tell time with fire. They were used in China since at least 6 AD. Some even could trigger alarms by burning through threads holding metal balls and causing them to fall, or used scented chips so you could tell time with a sniff

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nR7P TIL Grizzly bears were so feared and respected by Native Americans that hunting them required a company of 4 to 10 warriors and was done with the same preparation and ceremoniality as intertribal warfare.
pX5A TIL a town in Florida was named Frostproof as a marketing plot to claim that the town would never have a citrus frost. Less than two years after its founding a frost killed most of the citrus in town.
nZJW TIL when a Pacific tribe watched the US military perform drills to prepare for supply planes, the tribe believed it to be a religious ritual and built their own runways, coconut headphones, wooden radio towers, and marched around like the soldiers, in hopes of having a plane drop supplies off.
1a9lO TIL that Shaquille O'Neal earned a doctorate in education degree in 2012--his doctoral project explored how business leaders use humor in the workplace.
mjyv TIL that there is a 150-year-old mosque in Iran that, when viewed from the interior at certain hours of the day, produces an intense kaleidoscopic effect due to its unique pattern of tiling and colored glass