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In part two of Neanderthal Apocalypse, scientists take a look at what other factors might have affected the demise of the Neanderthals. Could it have been the eruption of a super volcano? And if so, the presence of a simmering super volcano in the backyard of the United States could mean devastation. Then a surprising look at the human genome at the University of Washington reveals that Neanderthal DNA may be living on in modern humans.