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Todd White wipes his face and tries to stay cool while installing a new roof on a business Friday, July 22, 2011, in St. Louis. A heat wave is smothering the Midwest with a heat index well over 100 in many places. (AP Photo/Jeff Roberson)

Nation wilts as heat wave spreads eastward

Americans withered under yet another day of searing sun Friday as a heat wave spread in earnest into the urban core of the Northeast, while warnings about excessive heat stretched from Kansas to Maine and the Carolinas. (AP)