PositiveELLE...Mukherjee punctuates his encyclopedic investigations of collective and individual heritability, and our closing in on the genetic technologies that will transform how we will shape our own genome, with evocative personal anecdotes, deft literary allusions, wonderfully apt metaphors, and an irrepressible intellectual brio that is suggested by the various epigraphs with which he prefaces each of his dozens of chapters, quoting everyone from Kafka to Snoop Dogg.