The human colon may represent the most biodense ecosystem in the world. Though many may believe that our stool is primarily made up of undigested food, about 75 percent is pure bacteria—trillions and trillions, in fact, about half a trillion bacteria per teaspoon. Do we get anything from these trillions of tenants taking up residence […]
In this Caltech lecture, Carl Zimmer, an award-winning science writer (New York Times, Discover), takes readers on a frightening tour of the H1N1 flu virus, how it evolved, and what deadly diseases tell us about how evolution works.
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