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TIL that Greeks and Romans polluted the air so much, traces of their lead pollution can be seen in ice caps as far away as Greenland

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YpxjP TIL that Quakes (as in Earthquakes) don't only happen on Earth. There are Moonquakes, Venusquakes and Starquakes, which happen on neutron stars. One such starquake happened on a star 50000 Light Years away and would have been a 32 on the Richter Scale.
ExDd TIL that the highest point in Pennsylvania is lower than the lowest point in Colorado.
wkWE TIL that Ayn Rand, upon her retirement, went onto Social Security and Medicare.
YmGr TIL that Harlan Ellison was once hired to write for Disney. Roy O. Disney overheard him in the lunchroom impersonating Donald, Goofy and Mickey, joking about making an animated porno with Disney characters. After lunch he found a pink slip on his desk. He had been fired on his very first day.
jakX TIL That A Chicken Gun is a Cannon designed to fire dead chickens at aircraft to test their resilience against bird strikes