Millions of people in the U.S. are trying to stay cool as the summer's first major heat wave continues to create dangerous conditions across the Midwest and along the East Coast. That heat is expected ...

Extreme humidity and triple-digit temperatures are affecting around 250 million people across the United States. Here's the science behind the heat dome that’s stifling the nation. A sunbather rests ...

It’s possible to train your body to better handle high temperatures in just a few weeks. By Katharine Gammon Inside a small, sealed room, Olivia Leach swallowed a pill that would soon monitor her ...