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In Arizona, nature is diverse and dramatic. The state's Tonto Natural Bridge State Park is home to the world's largest natural travertine bridge, where visitors can hike and explore its unparalleled ...

“We usually think of water as so benign, but when it’s divided in the form of little droplets, water is highly reactive,” said Richard Zare, describing a line of laboratory work that moves electricity ...

“Microlightning” exchanges among water droplets could have sparked the building blocks of life on ancient Earth, new research finds. Here, a wave breaks on White Sand Beach on the Thai island of Koh ...