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, changed how our young are born, drove evolution, and perhaps gave
us emotions. One expert even suggests that an ancient virus could have
entered our genes and rewired us for monogamy.
National Geographic investigates a provocative new theory that suggests
that all life – including humans – is descended from viruses.