When you think of yourself, you probably think of a single individual. In reality, you're a collection of human cells plus the community of microorganisms that live on and in your body.
Biologists call this community your microbiome--and it's a really, really big one.
How big? Roughly 100 trillion microorganisms are living on or in you right now. And far from being simply passive fellow travelers, these microbes do lots of work on your behalf.
Among other things, they help digest your food and keep your immune system healthy. For all the details, check out the latest episode of the YouTube video series ASAPScience above.
Want to learn more about the crazy way microbes colonize and control your body? Check out this "Talk Nerdy To Me" episode below.