National Geographic Earth Investigated Stone Age Apocalypse PDTV XviD
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Earth Investigated: Stone Age Apocalypse
Human evolution is believed to have begun some six million years ago. Despite the passage of so much time, the amount of diversity among the DNA of all humans is minuscule. Some 75-thousand years ago, something apocalyptic occurred that left relative few humans alive to carry on the species. The cause of this "bottleneck" is now believed to have been a massive volcanic eruption on the Indonesian island of Sumatra. Only in Africa did men survive, developing language and tools for the future
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