The conscious and unconscious decisions we make are deeply affected by an ancient and universal genetic programme. Our ambition and lust, our drives to compete and to co-operate are essential components of the human mind, forged among our ancestors on the African savannah. Instincts were instrumental in the evolutionary success of the species and success meant a fondness for sex and violence, for status and wealth, and a will to survive. Lord Winston is the pre-eminent professor of reproductive medicine in Britain.