Professor Lewontin's book counters the deterministic arguments of some well-known geneticists who would have us believe that all differences between human beings, social as well as physical and mental, are due to variations in our DNA, maybe modified to an extent by different environments. He points out the circular nature of the arguments used to support some of their unprovable statements and the straightfowardly unscientific nature of others. In particular, he rejects the claim of sociobiology that it provides a scientific explanation of the current state of human society. This is not alwys an easy book to follow, but it is essential reading in particular for those who are dubious about the "scientific" nature of DNA analysis and what it can tell us about human beings, whether individually or in society.