June 13, 2012 The human body contains about 100 trillion cells, but only maybe one in 10 of those cells is actually human. The rest are from bacteria, viruses and other microorganisms. Now, scientists have unveiled the first survey the "human microbiome," which includes 10,000 species and more than 8 million genes.
<iframe src="http://www.npr.org/player/embed/154913334/154943986" width="100%" height="290" frameborder="0" scrolling="no">
May 9, 2012 While U.S. adults have relatively uniform microbe colonies in their guts, adults in Malawi and Amazonia have much more diverse populations. Scientists are still struggling with why that is and what it means.
NPR thanks our sponsors
Become an NPR sponsor