Do you want to go to the park? Mango Doucleff, of San Francisco, responds to her favorite command by perking up her ears and tilting her head. Michaeleen Doucleff/NPR hide caption

itoggle caption Michaeleen Doucleff/NPR

Medical residents including Dr. Amy Ho (bottom right) helped with first aid at the Pitchfork Music Festival in Chicago. Courtesy Amy Ho hide caption

itoggle caption Courtesy Amy Ho

On Lumley Beach, after day trippers have headed home, prostitutes look for customers along a 100-yard stretch of road near some of the nicer hotels as well as near the bars and restaurants along the beachfront. Simon Akam/Reuters/Landov hide caption

itoggle caption Simon Akam/Reuters/Landov

Advocates for patient safety have had to confront the reality that steps taken to improve the quality of health care can also present opportunities for corruption and conflict of interest. Pascal Fossier/Ikon Images/Corbis hide caption

itoggle caption Pascal Fossier/Ikon Images/Corbis