This text examines DNA and explores how its concept has become part of popular discourse and become commonly interpreted as a more or less magical entity. The authors find that underlying most images of DNA is the view that it is the essence of a person, a new version of the soul. This idea is traced through many domains, from arguments about feminism, homosexuality and race to explanations of good and bad behaviour, adoption and economic success or failure, and on to DNA's growing use in court.