Dealing with the dog days: This pooch in Manhattan found one way to stay cool Thursday (July 21, 2011). Timothy A. Clary /AFP/Getty Images hide caption

itoggle caption Timothy A. Clary /AFP/Getty Images

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