Bacteria aren't all bad for you. In fact, they may well be the reason you're healthy. Scientists are just starting to figure out the role that the microorganisms that live on the human body play in human health. We dive in to take a microbe's eye view of the hidden world of the human microbiome.
On one side, they are battling forces loyal to the Assad regime; on the other, Islamist rebels from among their own ranks. But while the Islamists and the regime are both well-funded, the moderate rebels are looking to the U.S. for aid — and getting little in return.
Scientists are asking people to contribute samples of their gut microbes to help figure out how those microbes affect human health. But ethicists say sharing that information, as well as the personal health data that make it useful to researchers, poses risks. That's especially true for children.