For years, João Duarte has puzzled over a seemingly boring underwater expanse off the coast of Portugal. In 1969, this site spawned a massive earthquake that rattled the shore and sparked a tsunami.

A battle over plastic—a material so prolific the UN calls the 90 percent of it that ends up as trash a pollution crisis—is under way in Florida. Coral Gables, a small city of 51,000 people ...

Research shows that certain foods really can help with depression and stress. Here’s why—and which foods help most. Fermented vegetables like kimchi are thought to bolster your mood by ...

Photograph by Jim And Jamie Dutcher/National Geographic Creative 1976: Chemical plant accident in Seveso, Italy Toxic vapors expose thousands of people to some of the highest dioxin levels ever ...