Laura Molina, 9, shows the mask she created expressing the feeling of "sadness." Her mother is being treated for breast cancer at the Lyndon B. Johnson public hospital in Houston. Carrie Feibel/KUHF hide caption

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Some images of lung cancer are clear cut. But in many others, a nodule on the screen turns out not to be cancer at all. hide caption

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Vaccines against the HPV virus are already used to prevent cervical and anal cancer. Harry Cabluck/AP hide caption

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A 13-year-old girl gets an HPV vaccination from Judith Schaechter, a pediatrician at the University of Miami, in 2011. Joe Raedle/Getty Images hide caption

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Many arms, one robot: the business end of the da Vinci system is seen in this media handout image from the manufacturer. Mark Clifford/Courtesy of Intuitive Surgical, Inc. hide caption

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Actress Angelina Jolie at a news conference with Secretary of State John Kerry (in background) and other foreign ministers in London last month. They held a forum on how to reduce sexual violence against women in conflict zones — an issue she has often spoken about. Alastair Grant /PA Photos /Landov hide caption

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A microscopic image of prostate cancer. Researchers have found new genetic markers that flag a person's susceptibility to the disease, as well as breast and ovarian cancer. Otis Brawley /National Cancer Institute hide caption

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