WASHINGTON, D.C. — If you’re outside during a heat wave in Texas, the shade of oak trees can be tempting. But when it’s really hot, levels of lung-irritating ozone and…

The knotted, intricately braided string was like none Sabine Hyland had ever seen. Made of human hair, it was part of an ancient device used by the Inca. These people…

You’re more likely to be struck by lightning than bitten by a shark. Millions of people swim in the seas each year. But an average of just 64 bites are…

Picture a shark. You might think of a great white stalking beachgoers in a movie. Or maybe a hammerhead, with its distinctive T-shaped noggin. Or the extinct megalodon, the largest…

Most of us don’t think too much about what’s in our pee. We go, we flush, we forget. But that wastes a golden opportunity, some scientists say. They’re finding new…