Volunteer John Kelley (left) leads an exercise class at a senior center in Oklahoma on Monday. Centers such as these offer seniors a cool place to go during heat waves. Sue Ogrocki/AP hide caption

itoggle caption Sue Ogrocki/AP

A study found that women's bones didn't benefit from consuming more than 750 milligrams of calcium a day. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Seroquel, made by AstraZeneca, was the most prescribed of the atypical antipsychotics scrutinized in a federal audit of nursing home claims. Anonymous/AP hide caption

itoggle caption Anonymous/AP