“There is an inescapable component of heritability to many human behavioral traits. For virtually none of them is heredity ever close to predictive. Environment, particularly childhood experiences, and the prominent role of individual free choices have a profound effect on us. Scientists will discover an increasing level of molecular detail about inherited factors that undergird our personalities, but that should not lead us to overestimate their quantitative contribution. Yes, we have all been dealt a particular set of genetic cards, and the cards will eventually be revealed. But how we play the hand is up to us.”–Dr. Francis Collins (former head of the human genome project)