I consider myself to be a fairly normal human. Ten fingers, ten toes, two ears. Made up of thousands of different cells. Oh, and of all the cells in and on my body, the human cells are outnumbered tenfold by bacterial cells. Wait, did we get that right? Ten times more bacterial cells than human cells share the human body? Yes, that is indeed the average. Like many other relationships that have evolved over time between species, humans and bacteria form a symbiosis, or “living together,” that is