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Today I learned of Seneca Village, a settlement founded by free Black Americans that was seized and razed in 1857 to create New York's Central Park. Wealthy families successfully sued to prevent the seizure of their land that was the original site proposed for a park.

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R7pY8 TIL the boundary between the Earth's atmosphere and outer space is called the Kármán line
ANYdg TIL Hans Zimmer composed the Skylanders theme
OEN4 TIL a flock of passenger pigeons 1 mi (1.5 km) wide and 300 mi (500 km) long was once spotted in southern Ontario. The flock took 14 hours to pass overhead and held in excess of 3.5 billion birds.
4Xj9N TIL, Ming-Na Wen who is well known for role as Dr. Jing-Mei Chen in ER, was pregnant with her first child in 2000. As a result, she continued to act and her pregnancy was written into the E.R. script, with her character giving up the child for adoption, following her child's birth on November 2000.
kO4J4 TIL of the Oh-My-God particle, recorded in 1991 over Utah traveling 99.99999999999999999999951% the speed of light -The tiny particle had the kinetic energy of a 58 mph baseball (or 100 quintillion times the photon energy of visible light)