Beat the summer heat by going underground. Arizona is home to famous caves, like Kartchner Caverns. Here are 5 of the best ...

Scientists pulled 13 teeth from Ethiopian dirt and realized everything they knew about where we come from was wrong. These ...

Discover Arizona parks, lakes, canyons, and historic sites that offer scenic trails, quiet escapes, and unforgettable desert ...

The 1980 Mount St. Helens eruption remains the deadliest in U.S. history, fundamentally changing how scientists monitor ...

We know, the headlines can sound terrifying. In this series, Mashable speaks with experts to bring you the unvarnished truth about science, health, threats from space, and scary-sounding creatures.