Season 5 Episode 6

Virus Hunters

Aired Tuesday 10:00 PM Jan 13, 2009 on National Geographic
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Episode Summary

To many people, viruses are simply agents for disease, but they may possess far greater power than originally thought. Some experts now believe that viruses helped give rise to the first complex cells, played a role in the diversification of life, drove evolution, and perhaps gave us emotions. National Geographic investigates a provocative new theory that suggests that all life-including humans-is descended from viruses.moreless

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