For decades, the ritual was unquestioned: on a frosty morning, you'd start your car, let it idle for five, ten, or even ...

When a person suffers a stroke, physicians must restore blood flow to the brain as quickly as possible to save their life.

The Anasazi, a once-flourishing tribe in the American Southwest, lived on bounties of corn, squash and beans. In 1276 A.D., ...