Strider Discusses the largest mass extinction event, or maybe events, known to planet Earth. That's right! The Permian extinction was prior to, and even more extreme than the asteroid impact on the Yucatan Peninsula 65 million years ago. 

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Sources: Nationalgeographic.com ‘ The Permian Extinction - When Life Nearly Came To An End’ by Hillel J. Hoffman, Commons.wikimedia.org, @_milliepatel Twitter image, reddit.com/naturewasmetal, Britannica.com, julieandboris.com