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TIL that air sirens are not just really loud speakers but spinning wheels that create pressure waves

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kJkGW TIL about the 1980 Sunshine Skyway bridge disaster in St. Petersburg, Florida, U.S. The original bridge collapsed when it was struck by the freighter MV Summit Venture. 35 people died, including passengers on a Greyhound Bus.
1arNP TIL Indigenous Australians are the most ancient continuous civilisation on Earth, a fact backed by the first extensive study of their DNA, which dates their origins to more than 50,000 years ago. Scientists traced their linage to the DNA of modern populations in Australia and Papua New Guinea.
9wwjp TIL that in Des Moines, Iowa (population 215k) has seven parking spots for every citizen. At any time, Des Moines could park 45% of Iowa's population.
y0d8 TIL the word nimrod comes from a biblical figure, king Nimrod, who was a mighty hunter, but now means a stupid person after Bugs Bunny sarcastically referred to the hunter Elmer Fudd as nimrod in 1932. Most people did not get the joke and assumed it meant «stupid».
NX6De TIL that Bea Benaderet, Jethro's mother on The Beverly Hillbillies and Kate on Petticoat Junction was also the voice of Granny in the Tweety commercials and the original series voice of Betty Rubble on the Flintstones. She died at age 60 in 1968 before any of those shows finished from Lung Cancer.