"To the untrained eye, Rosalind Franklin's Photo 51 was simply a grainy black and white image of dark marks scattered in a rough "X" shape. But to the eye of a trained scientist, it was a clear portrait of a DNA fiber taken with X-rays. And to young scientists James Watson and Francis Crick, it helped answer a great mystery - how do organisms live, grow, develop, and survive, generation after generation? This simple picture would change the way scientists viewed life itself."--Page [4] of cover.

Glimpse of a photo -- Long chain of discoveries -- Racing to the prize -- New questions.