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Weighing as much as a small car, a rover named Curiosity rolls quietly around Mars. Curiosity's instruments collect data and its cameras take images of the Mars landscape, including self-portraits, in vivid color and detail.

To the untrained eye, Photo 51 was simply a grainy black and white image of dark marks scattered in a rough cross shape. They and others believed that finding the simple structure of the DNA molecule would answer a great mystery, how do organisms live, grow, develop, and survive, generation after generation?