It's fun to take a hike through the woods: listening for songbirds, looking at wildflowers, spying the occasional chipmunk. You also need to keep an eye out for the bane of hikers—poison ivy. Find out how much you know about this annoying plant by taking this true-false quiz.

The more active you are, the more calories you burn. Running or jogging, for instance, burns more calories than bowling.

Lung cancer is a cancer that starts in the lungs. The major cause of lung cancer is smoking cigarettes. Learn about risk factors for lung cancer by taking this short assessment.

Your body needs cholesterol to make hormones and to keep your cells healthy. Cholesterol comes from two sources: your liver and your diet. But if your diet exceeds the body’s need for cholesterol or saturated fats, your cholesterol level in your blood will increase. This video discusses treatments and lifestyle changes that may be prescribed by your doctor.