You could go through life exclaiming, "I didn't know that!" It's probably/maybe wiser to do that, as opposed to going around exclaiming "I knew that!"
We don't know what we don't know...
This little primer on the microbiome from Vox gets you thinking about your body in a new way. Think: thriving, seething little ecosystem. At least that's the new paradigm science wants you to try on for size.
Is it bad to have trillions of microbes living in and on you? No. It might be a very good thing!