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Did Mass Extinction Happen?

New evidence is causing geologists to question whether a terrestrial mass extinction 252 million years ago occurred. The findings seem to show that instead of a mass extinction, it was a million year change over. http://gizmodo.com/new-evidence-is-changing-what-we-know-about-the-deadlie-1741168422?trending_test_c&utm_expid=66866090-62.H_y_0o51QhmMY_tue7bevQ.3&utm_referrer=http%3A%2F%2Fgizmodo.com%2F%3Ftrending_test_c #tech

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