Michelle Kloser, School Nutrition Director for the West Salem School District in Wisconsin took this picture of Thursday's lunch, which includes baked chicken and rosemary potatoes. Michelle Kloser/ for NPR hide caption

itoggle caption Michelle Kloser/ for NPR

Eric Wiltz cavorts on a trampoline in New Orleans in 2010. Everything is fun and games on the backyard attractions until someone gets hurt, a leading group of pediatricians says. Sean Gardner/Getty Images hide caption

itoggle caption Sean Gardner/Getty Images

Evan Ciangiulli, 4, completes a warmup that teaches him the right way to lift weights. Karen Castillo Farfan/NPR hide caption

itoggle caption Karen Castillo Farfan/NPR

Arefa with her host family, sisters Jami Valentine (left) and Staci Freeman. Doctors in the U.S. have been treating Arefa's third-degree burns, and also performed skin-graft surgery for the top of her head. Each morning still requires a fresh dressing. Gloria Hillard for NPR hide caption

itoggle caption Gloria Hillard for NPR

Canned food is a source of BPA exposure, but researchers aren't sure whether it causes childhood obesity. Above, the soup isle at a grocery store in Washington, D.C. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

Nurse Fatima Guillen (left) gives 4-year-old Kimberly Magdeleno a whooping cough booster shot at a health clinic in Tacoma, Wash., in May. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP