"The next time you look in a mirror, think about this: In many ways you're more microbe than human." -Rob Stein, reporting for NPR. In this five-minute animated video, Stein explains the "microbiome," meaning the population of microbes living in our bodies. These microbes—especially those in the gut—are primarily symbiotic, helping with digestion and even immune response.

If you've ever wondered what "probiotics" or "prebiotics" are, this is a highly digestible overview.