I've been really interested in the developing research about the human body as a super-organism or an ecossystem, where non-human cells outnumber human cells 10-to-1. The notion that we have bacteria in our bodies is not unfamiliar, although it's mostly linked to things that make us sick and things that live in our intestine and help digest our food. But it's not just bacteria, there are fungus, mites, algae and other kinds of eukayotes. And a lot of these are essential to our health and well-being, and the extent that they influence how we feel, or the extent to which they are us, too. This piece is the beginning of an exploration of the identity of our other self.