They fascinate. They repel. Some pose a danger. Most are harmless. And whether they are seen as scary creatures or colorful curiosities, snakes play important environmental roles in the fragile ecosystems of the nation's wildlife areas.

This calculator is for children with asthma. If you know your child's height, you can find his or her predicted peak flow.

Osteoporosis is a disease that slowly weakens bones until they break easily. People who have a broken bone related to osteoporosis often experience a downward turn in their overall health.

Type 2 diabetes is the most common type of diabetes. It is more common in adults, but you can get it at any age. Find out what causes type 2 diabetes and what you need to do to keep it in check.