Guns, Germs, and Steel
From that platform the authors discuss ideas that range from the possible origins of the Arthurian legend in Britain to the Spanish colonization of the Americas. Others have attempted this, for example in Jared Diamond's Guns, Germs, and Steel. But, according to Kelleher, Cochran and Harpending go one better than Diamond. He goes on to state that where Diamond was content with environmental determinism, at times opposing the roles of human biology and population differences, Cochran and Harpending embrace them both. Their discussion of gene flow becomes the core of an argument for biology as central to history, and the backdrop for the book's two major hypotheses.