The bite of a cobra can paralyze its victims and, if enough venom is released, fatally stop their breathing. It's estimated that more than 75 percent of patients in India who die from a snake's bite never make it to the hospital. STRDEL/AFP/Getty Images hide caption

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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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Angelina Jolie took a genetic test to find out her risk of breast cancer, and had a preventive double mastectomy. Alastair Grant/PA Photos /Landov 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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The American Academy of Pediatrics recommends that children have no more than two hours a day of "screen time." Marilyn Nieves/ hide caption

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People following a 5-2 diet would eat lean protein and non-starchy vegetables two days a week. Heather Rousseau/NPR hide caption

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The mosquitoes that feed on people are attracted to over 300 gases and other compounds emitted by human skin. CDC Public Health Image Library hide caption

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