Heat Wave: In heat waves, sweltering nights carry dangers

As the U.S. and Canada enter into a heat wave, I get a lot of questions about how heat impacts human behavior and our moods. So three years ago, I wrote a blog.NEW YORK -- A lengthy, blistering heat wave that is blanketing the eastern half of the United States is putting significant stress on the nation's power grid as homeowners and businesses crank up their air conditioners.Heat Wave. Date Thursday, July 21, 2011 at 8:11 PM. Photos by Jason Hirschfeld, Gerry Broome / AP Images. The First

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