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TIL that some of the stones used in the creation of Stonehenge were bluestones from the Preseli Hills in western Wales and may have been chosen for their acoustic properties.

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X0kAQ TIL the town of Center in North Dakota was named in 1902 because of its proximity to the center of Oliver County. In 2017 geography proffessor Peter Rogerson used azimuthal equidistant projection to calculate the geographical center of North America only to discover it was Center, North Dakota.
KYj09 TIL that hippopotamuses are an invasive species in Colombia. Pablo Escobar brought four to his private zoo in the 70s, and after his death they escaped. Their population grew to around 100, earning them the nickname “cocaine hippos”
x6Vj1 TIL Reyn Guyer is a game designer whose first hit was Twister. In 1969, he invented "the world's first indoor ball". It was made of polyurethane and named after the foam used by off-roaders to cover their roll-bars: Nerf.
ZpxO4 TIL the cover of the Clash's 1979 album London Calling which has the album title in pink letters down the left side and green text across the bottom is an homage to Elvis Presley's self-titled debut album which featured a similar design.
e0bl6 TIL the Microsoft Flight Simulator series predates Microsoft Windows by 3 years, making it one of the longest running PC games series of all time.