How Values Develop

We have commonly believed that all that we know, and how we think, is all learned after we are born. John Locke, with his idea that are minds are blank slates when we are born, made sense--until recently. Studies with identical and fraternal twins have shown us how heredity influences our behavior. But the new science of epigenetics shows how, and which, genes are affected by the environments of our ancestors--or of ourselves. These genetic and epigenetic influences are usually permanent an...