Looking for some bucket-list travel ideas? You can't go wrong with these natural wonders—though you might not believe your eyes, even when you're right there.

Gemstones are valued based on the Four Cs - color, clarity, cut, and carat. Precious stones include diamonds, sapphires, ...

In the Arizona desert, researchers are uncovering extraordinary details about the peoples who have inhabited this land since ...

The math that describes the branching pattern of trees in nature also holds for trees depicted in art—and may even underlie ...