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TIL Pistol Shrimp is one of the loudest animal on the earth.

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jB4p TIL The Maserati Quattroporte’s exhaust frequency is 333Hz—A frequency purported to stimulate sexual arousal in women
wLRZ7 TIL that pterodactyls are not dinosaurs. Dinosaurs are members of the group Dinosauria which pterodactyls are not. Pterodactyls belong to the group Pterosauria.
l7j1N TIL about Mayhem, a Norwegian Black Metal band. In 1991, their vocalist at the time, Per "Dead" Ohlin, committed suicide. Their bassist, Euronymous, discovered Dead's body and took a photograph of the scene. Euronymous was then murdered 2 years later by another band member, Varg Vikernes.
4Xe0J TIL that a Japanese TV show apparently hired 3 experts in fluid mechanics, engineering, and dentistry to determine the best way to hold a burger. After 4 months of research, they concluded that your pinkie and thumb should be on the bottom, while the remaining fingers should be on top of the burger.
W7XXd TIL: Due to the Flint Michigan crisis, a study dubbed the Truth Fairy Project was done on baby teeth and the exposure to lead. Baby teeth provides easy to use info on lead levels. This led to evidence that there is no such thing as a "safe" threshold of exposure.