Wetware drives human behavior – the chemistry of the brain and body. It is popular these days to talk about the brain being hardwired. Immediately an image of circuits in the brain, fixed connections and messages being shunted around comes to mind – as if the brain were a complex railway network or road system; stimulus in, response out, and clever switchgear organizing it all. But not so; the whole process is much more fluid and complex than such a metaphor suggests.