A Prehistoric Murder Mystery: Earth’s Worst Mass Extinctions

LiveScience: Paul Wignall is the author of "The Worst of Times: How Life on Earth Survived Eighty Million Years of Extinctions" (Princeton University Press). He is professor of paleoenvironments at the University of Leeds. He has been investigating mass extinctions for more than 25 years, a scientific quest that has taken him to dozens of countries around the world. Wignall contributed this article to Live Science's Expert Voices: Op-Ed & Insights. There have been good times and bad times in world history,......

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