As extreme heat grips the eastern U.S., some people are dismissive of warnings. Why does this seem to happen more for extreme heat than extreme cold?

Heat domes trap overnight temperatures too — and millions without air conditioning are facing this week's Eastern U.S. heat wave.

As extreme heat grips the eastern U.S., some people are dismissive of warnings. Why does this seem to happen more for extreme heat than extreme cold?

With record-high temperatures expected through Saturday, summer camp directors, nonprofit leaders and local officials are racing to keep children and older people safe.