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Nation wilts as heat wave spreads eastward

Associated Press
An early morning cyclist and a jogger head to downtown along the shore of Lake Michigan Wednesday, July 20, 2011 in Chicago. Much of the United States is trapped under a heat "dome" caused by a huge area of high pressure that's compressing hot, moist air beneath it, leading to miserable temperatures in the mid-90s to low 100s and heat-index levels well above 100 degrees. (AP Photo/Kiichiro Sato)

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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)

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