In his 1968 memoir, The Double Helix (Readers Union, 1969), the brash young scientist James Watson chronicled the drama of the race to identify the structure of DNA, a discovery that would usher in the era of modern molecular biology. After half a century, the implications of the double helix keep rippling outward; the tools of molecular biology have forever transformed the life sciences and medicine. The Annotated and Illustrated Double Helix adds new richness to the account of the momentous events that led the charge.