David Shenk: Nature, Nurture and Genes

Do our choices affect our genes? David Shenk, author of "The Genius In All of Us: Why Everything You've Been Told About Genetics, Talent, and IQ Is Wrong," says they do. Our environment - how we live, what we eat, if we smoke - can alter what our genes are asked to do. Using the new field of epigenetics, he challenges our old thinking about 'nature vs. nurture', parental responsibility and intelligence.