Refugees fill cans with water inside a camp in Baalbek, Lebanon, for Syrians who have fled the fighting in their country. Spencer Platt/Getty Images hide caption

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Health workers vaccinate a boy against polio at a May immunization drive in Mogadishu, Somalia. Farah Abdi Warsameh/AP hide caption

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Soda bottles and household chemicals are sometimes used to make low-power bombs. iStockphoto.com 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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Dylan Murphy, 3, plays with a swan at the Please Touch Museum in Philadelphia. It was his first trip to a museum that didn't overwhelm him. Courtesy of Noelle Murphy hide caption

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The newest version of the Robohand is made of snap-together parts, reducing the amount of hardware needed. Courtesy of Jen Owen of Jen Martin Studios hide caption

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Instructional assistant Jessica Reeder touches her nose to get Jacob Day, 3, who has autism, to focus his attention on her during a therapy session in April 2007. Rich Pedroncelli/AP hide caption

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Beheading Barbie is the kind of aggression that can cause sibling distress. iStockphoto.com hide caption

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Barton Holmes, 2, sits with his father, Kevin Holmes, and his mother, Catherine McEaddy Holmes, during an appointment at Children's National Medical Center in Washington, D.C. Maggie Starbard/NPR hide caption

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Sarah Murnaghan, center, on May 30 as she and her parents marked the 100th day of her stay in Children's Hospital of Philadelphia. Her father, Fran, is at left. Her mother, Janet, is at right. Murnaghan family/AP hide caption

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More than 200 people have Walking Gallery jackets that tell the story of their experiences with health and the medical system. Maggie Starbard/NPR hide caption

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