This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. ST. LOUIS – In this heat, days start warm ...

It’s a T-shirt kind of day in Washington, DC: 85 degrees with 63 percent humidity. We all know those numbers mean hot, but what exactly does that humidity percentage tell us? And why should we care?

NEW YORK (Reuters Health) - Many people with chronic headaches believe that weather changes trigger their woes. Turns out they may be right, suggest new research findings. In a study of 25 children ...