An intelligent persons guide to genetics
The book deals well with the question of what makes humans different from other animals. Do we have extra genes, or are the genes we have in common slightly different. Are different genes turned on, and does 'junk DNA' play any part. You won't get any answers - these are still research topics - but you will get a better idea of the questions being asked. I did feel that the book was lacking a proper discussion of the ethics of the subject. Woolfson does speculate on how humans may modify themselves in future, but doesn't seem to think that we have much choice in the matter. If he believes that such changes will be beneficial, then I would say that he should give a lot more space to arguing his case.