For every in-group, there must exist at least one outgroup.... You might assume that you end at the border of your skin, but there’s a sense in which there’s no way to mark the end of you and the beginning of all those around you. Your neurons and those of everyone on the planet interplay in a giant, shifting superorganism. What we demarcate as you is simply a network in a larger network." - Read an excerpt about social neuroscience from "The Brain" in the Financial Times.