" ... Wolpert, an internationally acclaimed embryologist, draws on the recent discoveries of genetics to demonstrate how human life derives from a single cell and then grows into a body: an incredibly complete society made up of billions of cells. Wolpert sensitively examines the science behind often controversial research topics that are much discussed but rarely understood - stem cell research, cloning, DNA, and mutating cancer cells - all the while illuminating how the intricacies of cellular behavior bear directly on human behavior. "--Inside jacket.