This book is composed of sixteen chapters that anticipate philosophical questions from a typical non-scientific audience: the origins of atheism, the shifting hierarchal positions of humanity through history as proposed by Copernicus and later by Darwin, human brain size, and the dawning of consciousness as a result of the growth and development of moral sentiment and inventiveness through natural selection. Interestingly, at the end of the book, the book discusses the historical power relationships of ruling governments and predicts that as humans evolve and become more civilized, war will eventually end.