On a late July morning, the sun is already broiling the National Mall in Washington, D.C. The air is so humid, even a loose shirt quickly turns into a sticky mess. Later, the heat index will top out ...

How the neck fans work Consider the main strategy our bodies use to cool down: sweating. "The heat of vaporization gets pulled from that sweat into the atmosphere," says Dr. Adam Watkins of the ...

Jeffrey Pagulong and his son Christof stand in front of the Lincoln Memorial in Washington, D.C., on July 29. Pagulong, who is visiting from Boston, said his neck fan "helps a lot" in the high ...