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TIL of Biofouling, the accumulation of microorganisms, plants, algae, or small animals on surfaces such as ship and submarine hulls. Due to the increased drag this causes a ship, it can cost a vessel up to 40% more in fuel costs. The US Navy alone around $1 billion a year because of biofouling,

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4XRYX TIL about Dewey Beard, the last Native American veteran of the 1876 Battle of Little Bighorn. In 1892, his family was killed by the US Army at the Wounded Knee Massacre, and he was shot. In 1942, the Department of War confiscated his land to form a firing range. He died in poverty in 1955.
nXo7 TIL that part of the Manhattan Project involved injecting patients with plutonium to see what would happen
VBonp TIL That when pet rats are happy, they will boggle, which is when their eyes pop out of their head while their teeth chatters
Y7yaP TIL of Tanis, a dinosaur fossil site in North Dakota. Although controversial over its private management by paleontologist Robert DePalma, it's regardless noteworthy for preserving in detail the immediate aftermath of the extinction-causing asteroid impact on dinosaurs in the area.
ne0nW TIL there's seven species of dinosaur that have a 'live' appearance in the film Jurassic Park, but only two, the Brachiosaurus and Dilophosaurus were actually from the Jurassic period. The other five: Gallimimus, Parasaurolophus, Triceratops, T-Rex, and Velociraptor were all from the Cretaceous.