<Para ID="Par1">Advances in the study of social behavior require a revision in the economic concept of the invisible hand, which states that self-interested behavior leads to well-functioning societies without individuals having the welfare of the society in mind. Evolutionary theory shows that self-interest...</para>

The adoption of agriculture was one of the most momentous transformations in human history. It set into motion forces that changed our species from living in small numbers within the confines of local ecosystems into one that is now changing the biophysical characteristics of the entire planet....