Acclaimed author Matt Ridley's thrilling follow-up to his bestseller Genome. Armed with the extraordinary new discoveries about our genes, Ridley turns his attention to the nature versus nurture debate to bring the first popular account of the roots of human behaviour.What makes us who we are?In February 2001 it was announced that the genome contains not 100,000 genes as originally expected but only 30,000.This startling revision led some scientists to conclude that there are simply not enough human genes to account for all the different ways people behave: we must be made by nurture, not nature.Matt Ridley argues that the emerging truth is far more interesting than this myth.Nurture depends on genes, too, and genes need nurture. Genes not only predetermine the broad structure of the brain; they also absorb formative experiences, react to social cues and even run memory. They are consequences as well as causes of the will.Published fifty years after the discovery of the double helix of