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TIL in the US west of Washington DC there’s a National Radio Quiet Zone - 13,000 square miles (34,000 sq km) of radio silence where cellphones are banned

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via reddit.com

ANL1g TIL that the World Wide Web (WWW) was invented in 1989 at CERN. The Web was originally conceived and developed to meet the demand for automated information-sharing between scientists in universities and institutes around the world.
Dy6Y TIL that a 2009 study at two North American universities concluded that Shania Twain’s face possesses the ‘golden ratio'—or perfect distances—between a woman’s eyes and mouth that determines whether she is thought to be beautiful
mxD4Y TIL of the He-gassen, a 17th-century Japanese art scroll depicting people having "Fart competitions". The author is unknown.
d8OZ9 TIL that B.F. Skinner almost convinced the army to use pigeon-guided missiles, where pigeons would sit in the nose of the missile and peck a screen to change the direction.
6EgMY TIL that Princess Pauline von Metternich and Countess Anastasia Kielmannsegg fought a topless duel with swords in August 1892 after arguing about flower arrangements. Baroness Lubinska, who had a medical degree, insisted they fight topless so clothing couldn’t get into a wound and cause sepsis.