gene but it alters how and when the gene is expressed. It explains how two organisms can be genetically identical yet phenotypically variable, examples identical twins divergence,queen bees and worker bees,catterpillar and butterfly. The Epigenome is the missing link between nature and nurture as it reflects environmental differences. Epigenetic modifications are heritable in the short term but do not involve mutation of the DNA . It is the mechanism behind transgenerational Lamarckian inheritance ,for instance poor food availability during crucial gestational development may lead to later pathological consequences visiting two successive generations.Even a father's diet can directly influence the gene expression and health of his offspring.The organism can be affected by an environmental event long after this initiating event has occurred.Research shows that abuse and neglect in childhood can often result in mental illness in adulthood through epigenetic mechanisms modulated by hormonal signalling during critical developmental stages. The diverse applications of this new biological revolution are truly mind boggling whether in cancer research. ageing research, cloning process,sex linked disease or the study of memory.Epigeneticists are likely to be at the forefront of the next batch of Nobel prize candidates. The book is a real tour de force, it is timely and informed by the latest genetic research described in an approchable style for the non expert.Its optimism is contagious though I have my reservations about cancer cure or delaying ageing.The genetic story is just beginning to unfold and there is still a lot more to come.This is a good place