Examine some of the science underlying a new paradigm for understanding how the body works, in these videos from NOVA Wonders: What’s Living in You? The human body is like an ecosystem, with trillions of microbes living in us and on us. First, meet Dr. Piotr Naskrecki, who volunteered his body to host bot fly larvae. Then, through computer visualizations, learn about the roles that the viruses, fungi, and bacteria that inhabit the human microbiome play, not only in making you sick, but in keeping you healthy. This resource is part of the NOVA Wonders Collection.