Every 15 minutes, land equal to the size of a football field sinks into the Gulf of Mexico. One scientist proposes a new reason for the state's sinking feeling.

Doctors may soon have a prescription for health that even kids will like: more playtime.

Tiger habitats worldwide have shrunk 40 percent in the past decade and their survival depends on cracking down on poaching, working to reduce conflicts with humans, and protecting key ranges.

Just a few thousand years ago, humans followed monsoon rains to the Sahara Desert and were greeted with lush vegetation and plentiful wildlife.

Sand dune records show that wind is the reason behind the drought of the Medieval Warm Period.

A new computer rendering realistically portrays golden hair.