Meet your microbes

Our bodies are covered in a sea of microbes — both the pathogens that make us sick and the "good" microbes, about which we know less, that might be keeping us healthy. At TEDMED, microbiologist Jonathan Eisen shares what we know, including some surprising ways to put those good microbes to work.

Jonathan Eisen studies the ecology and evolution of microbial communities — and their co-evolution with their hosts.