A child cools off in mist at the Henry Doorly Zoo in Omaha, Neb., Monday, July 18, 2011. A heat wave is smothering the Midwest with a heat index well over 100 in most places. Cooling centers are ... more 
A child cools off in mist at the Henry Doorly Zoo in Omaha, Neb., Monday, July 18, 2011. A heat wave is smothering the Midwest with a heat index well over 100 in most places. Cooling centers are opening, and farmers are scrambling to prevent more livestock deaths. (AP Photo/Nati Harnik) less 
1 / 1
Associated Press | Photo By Nati Harnik
Mon, Jul 18, 2011 6:27 PM EDT