We’re finding that neurons aren’t the only important cells in the brain; glial cells, long ignored, turn out to do a hell of a lot, possibly even communicating with each other without synapses. The enteric nervous system, which controls your stomach and intestines, is looking more and more important for understanding the mind, but it’s extremely difficult to measure and therefore largely unexplored. We’re even finding that microbes in your stomach have a huge effect on mental states, and nobody knows how or why.
