From James Gleick, writing in the New York Times Book Review:

Mukherjee’s analysis of these episodes is clarifying and, in my view, definitive. He notes the narrow and shifting definitions of “intelligence” and its measure by flawed and culturally bound tests. To understand the debate properly, though, we need to recognize how artificial our racial categories are to begin with. The explosion of knowledge that has come from the Human Genome Project and its successors allows statistical measures of genetic diversity in groups we classify as “races.” Between the races, diversity is slight; within them, diversity is enormous.

The gene is, and is not, the determiner of our identity. It behooves us to accept this paradox and understand it. As we learn how our genome defines us, we also learn how we transcend our genome. The gene, in the era of recombinant DNA, has become an instrument of its own manipulation. We have gene therapies and gene editing. In what Mukherjee calls the “post-genomic” world, we will wield a power as exhilarating as it is treacherous. Simply put, “We will learn to read and write our selves, ourselves.”