A man takes a rest under a tree in downtown Chicago, Thursday, July 21, 2011. Government forecasters issued excessive heat warnings for a huge section of the country, from Kansas to Massachusetts, while some southern states were under heat advisories. (AP Photo/Nam Y. Huh)

Associated Press
A man takes a rest under a tree in downtown Chicago, Thursday, July 21, 2011. Government forecasters issued excessive heat warnings for a huge section of the country, from Kansas to Massachusetts, while some southern states were under heat advisories. (AP Photo/Nam Y. Huh)
A man takes a rest under a tree in downtown Chicago, Thursday, July 21, 2011. Government forecasters issued excessive heat warnings for a huge section of the country, from Kansas to Massachusetts, while some southern states were under heat advisories. (AP Photo/Nam Y. Huh)
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