The appearance of oxygen in Earth's atmosphere was a turning point in the history of our planet, forever transforming the environment and setting the stage for complex life. This event, known as the ...

Scientists have created the world's hottest engine running at temperatures hotter than those reached in the sun's core. The ...

An arsonist allegedly started the Palisades fire, Disneyland raises ticket prices (again) and more big stories.

Olympic open-water swimmer Keri-anne Payne explains how to incorporate your sighting into your breathing so you waste less ...

Fires can smolder underground for months. "It really is more common than I think people realize,” a fire scientist says. “It just doesn’t usually reignite another fire." ...