Viruses Have Guided the Path of Human Evolution

The struggle between humans and viruses stretches back far into the dusty depths of history, and it appears that we wear the scars of this epic battle in that most personal of places: our genome.

Whenever a viral epidemic tears through a community, there are those lucky enough to possess mutations rendering them immune to the disease. If the epidemic is large enough, this mutation can become embedded in our genome, both because of its protective powers, and because those with it will be o

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