*A full executive-style summary of this book is available at newbooksinbrief.wordpress.com

Since the dawn of self-awareness we human beings have struggled to understand ourselves. This struggle has found form in religion, philosophy, art and, most recently, science. The most pivotal turning point in science's quest to understand humanity came with Charles Darwin's theory of evolution by natural selection in the mid 19th century. While the application of this theory to understand human behaviour has taken time (and engendered a great deal of controversy), enough progress has now been made to outline the story in full, and to fill in several of the details. It is just this task that legendary biologist E.O. Wilson takes up in his new book `The Social Conquest of Earth'.

For Wilson, understanding humanity must begin with an understanding of how we came to be the ultrasocial species that we are. Drawing upon evidence from other eusocial species (such as bees, wasps, termites and ants--the latter of which Wilson has spent much of his career studying), as well as numerous sciences focused in on humanity and its past, Wilson recreates this story. According to the author, the story reaches its first major turning point when our ancestors began establishing home-bases at which they raised their young, and near which they foraged and scavenged for food. This development itself was largely a result of a genetic modification that led our ancestors to rely more and more on meat in their diet (and was greatly spurred on by, if not entirely dependent upon, the ability to control fire, which fire was used to establish more lasting campsites).

Once human beings had established nests, environmental pressures began selecting for traits that increasingly drew group members into cooperative relationships with one another (which cooperation was beneficial in such enterprises as hunting expeditions). This added cooperation not only contributed to the extent to which these early humans could reap resources from the environment, but also helped them in competition with other groups--especially in warfare. The benefits of cooperation and cohesion in allowing groups to out-compete other groups eventually allowed group-level selection to add a layer of tribalist sentiment to the members of our species (which tribalist sentiment draws from us a deep attachment to our in-groups, and a corresponding mistrust and contempt for members of out-groups). This tribalist sentiment eventually set the stage for the development of the first religions. The cooperative and tribalist sentiments that evolved during this time ultimately explains why our psyches are torn between selflessness and selfishness, virtue and vice. (On the topic of group-level selection, it turns out that this theory has been out of favour in the scientific community for over 40 years, and a big part of Wilson's purpose here is to resurrect the theory, and reestablish its credibility.)

Backing up in our story just a bit, for our in-group cooperation to occur, added mental equipment was needed (and evolved) that allowed humans to understand each others' intentions and work together to achieve goals. This added mental ability drew upon earlier increases in brain capacity that our ancestors had used first for life in the trees, and later for life on the ground, to fashion rudimentary tools. Eventually, the added mental capacity evolved into the ability to understand abstraction, and to use arbitrary symbols for communication, thus leading to the evolution of language.

Once the capacity for abstraction and language were established, the capacity for culture exploded and our ancestors were set on the fast track that led to our current way of life. Specifically, the onset of language led to the development of religion, art and music, and all of the other trappings of culture that we know and enjoy today. Wilson takes us through each of them one by one, and the process of gene-culture co-evolution that acted upon them, in order to help us understand how this process unfolded. Later, the explosion of culture led to technology that eventually gave rise to agriculture, and then to the rise of chiefdoms, and finally states and the first true civilizations.

Wilson's work is well geared to a general audience and he very rarely goes outside of what might reasonably be expected from such an audience. On the rare occasions when he does, he is sure to follow this up with a simplified summary of his line of thought. Also, Wilson occasionally strays outside of his story to moralize and (at the end) prognosticate on the future, and at times these efforts seem awkward and out of place. Again, though, these forays are few and far between, and many will no doubt enjoy them. A full and comprehensive summary of the main argument of the book is available on the website newbooksinbrief.wordpress.com; the information in the article will also be available in a condensed version as a podcast soon.