Inside your insides

Tiny living things so small that you need a microscope to see them. And every person carries around trillions and trillions of these critters.? Six of the most common ?critters? that live in and on our bodies are introduced here: bacteria, archaea, viruses, fungi, protists and mites. Each one has its own preferred environment, and readers will be startled (and likely a little grossed out!) by the many places they live, including the hair follicles on our faces, the folds of our tongues and the lengths of our guts.