Rob Knight is a pioneer in studying human microbes, the community of tiny single-cell organisms living inside our bodies that have a huge and largely unexplored role in our health.

The three pounds of microbes that you carry around with you might be more important than every single gene you carry around in your genome,” he says.

Rob Knight explores the unseen microbial world that exists literally right under our noses and everywhere else on our bodies.

This talk was presented at an official TED conference, and was featured by our editors on the home page.