Date and Rate of Earth's Most Extreme Extinction Pinpointed: Results Stem from Largest Ever Examination of Fossil Marine Species
http://www.sciencedaily.com/releases/2011/11/111117143955.htm
Global Extinction: Gradual Doom Is Just as Bad as Abrupt
http://www.sciencedaily.com/releases/2012/02/120203113308.htm
Saturday, February 4, 2012
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