Dr. Nayna Patel performs an ultrasound exam on Rinku Macwan, at a hospital near Ahmedabad, India. It's illegal in India for doctors to reveal a baby's sex during these exams, but many do it anyway. Sam Panthaky/AFP/Getty Images hide caption

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David Oliver sits quietly as he waits for the results of a scan at Ellis Fischel Cancer Center in Columbia, Mo., in 2012. The University of Missouri research professor was diagnosed with cancer in September 2011. He broke the news to colleagues via a video on the Internet. Jeff Roberson/AP hide caption

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Otolaryngologist Sandra Lin uses under-the-tongue drops to treat patients with allergies at Johns Hopkins in Baltimore. Courtesy of Keith Weller/Johns Hopkins Medicine hide caption

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A micrograph of HeLa cells, derived from cervical cancer cells taken from Henrietta Lacks. Tomasz Szul/Visuals Unlimited, Inc./Getty Images hide caption

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A towel covers the face of a man in a geriatric day care facility of the German Red Cross at Villa Albrecht in Berlin. Carsten Koall/Getty Images hide caption

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About a third of the world's population is thought to be infected with Mycobacterium tuberculosis, but only a small fraction of people get the disease. NIAID_Flickr hide caption

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April DeBoer (second from left) sits with her adopted daughter Ryanne (left) and partner, Jayne Rowse (fourth from left), and her adopted sons Jacob (middle) and Nolan (right) at their home in Hazel Park, Mich. The lesbian couple's desire to adopt each other's children has grown into a potentially ground-breaking challenge to Michigan's ban on same-sex marriage. Paul Sancya/AP hide caption

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Dr. Frank Dumont at his clinic in Estes Park, Colo. Barry Gutierrez for NPR hide caption

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Group therapy is popular in mental health circles. Are group appointments for medical conditions worth a try? iStockphoto.com hide caption

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Social worker Nuria Casulleres shows a portrait of Audrey Hepburn to elderly men during a memory activity at the Cuidem La Memoria elderly home in Barcelona, Spain, last August. The home specializes in Alzheimer's patients. David Ramos/Getty Images hide caption

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