Preschool students from Nikki Jones's class at Porter Early Childhood Development Center in Tulsa line up in the hallway on their way back from outside play. John W. Poole/NPR hide caption

Recent rains kept Suzanne and Mike Collins' orange grove alive, but the rainy season is ending. If they don't get federal irrigation water by this summer, their trees will start dying. Kirk Siegler/NPR hide caption

Morphine and oxycodone (the active ingredient in Oxycontin) are strong narcotic pain relievers on their own. Moxduo, a drug now up for FDA approval, would combine morphine and oxycodone in a single capsule. Rich Pedroncelli/AP hide caption

Former Secretary of State Hillary Clinton delivers a keynote address in San Francisco. Ben Margot/AP hide caption

Louise Hastie, the shelter manager of Nowzad Dogs in Kabul, holds a stray puppy named Aki. Afghanistan has a large population of street cats and dogs. While there are no government programs to control the animals, foreigners have taken in some. David Gilkey/NPR hide caption

Jason Molina performs in Barcelona with Magnolia Electric Co. in 2009. Jordi Vidal/Redferns hide caption