Teams of microbes are at work in our bodies. Here's how to figure out what they're doing

Teams of microbes are at work in our bodies. Here's how to figure out what they're doing: In the last decade, scientists have made tremendous progress in understanding that groups of bacteria and viruses that naturally coexist throughout the human body play an important role in some vital functions like digestion, metabolism and even fighting off diseases. But understanding just how they do it remains a question.