A killer on the lam for 251 million years

08/28/2008 | McClatchy Washington Bureau

It was the greatest mass murder ever and the culprits have eluded positive identification for 251 million years. Back then, 95% of marine species perished, as did most land creatures. Now, scientists think they're close to finding the killers. It all started, they think, with an explosion of molten lava in Siberia.

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McClatchy Washington Bureau

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