"It really is the case that evolution has become a set of basic principles that really explains life," he said. "As that becomes ever more apparent and ever more powerful, then it's clear that something's got to give with respect to our own species. Tell me exactly why humans are an exception." Hence: chickens. The conclusion that will surprise most people is that there's altruism in hens, too, and there's an evolutionary reason for it. Wilson goes so far as to call evolution "a theory of everything." "All of this could be explained by these very simple principles," Wilson said....