Atherosclerosis, or coronary artery disease (CAD), plays a major role in the leading cause of death in this country: heart attack. Learn more about this disease and a common procedure used to treat it.

About half of all pregnancies are unplanned, says the American College of Obstetricians and Gynecologists. But women today have many safe and reliable options to choose from if they want to prevent pregnancy. Test your knowledge of contraception by taking this quiz.

Asthma is a disease that affects the lungs. It is the most common long-term disease of children. Test your knowledge of living with asthma with this quiz.

Find out how much you know about asthma basics with this quiz.

True or False: Arthritis affects only the wrist, ankle, and knee joints.

Just because a medicine is available without a prescription doesn't mean it's safe to take. Take this quiz and learn the ins and outs of OTC medicines.

Organic ingredients are grown and processed without artificial additives and used in a wide variety of products. Find out more about organic foods by taking this quiz.

Nicotine, one of the main chemicals in tobacco, is the primary reason that smoking is so addictive. Even though most smokers know that smoking is bad for them, they find it difficult to quit because of the nicotine's effect.

Answer this one: Although mammograms can identify tumors at a very early stage, the tumors may have been growing for how long by the time they show up on the X-ray?

True or false: The most serious effects of lead exposure in children are vomiting and weight loss? Learn the answer by taking the Lead Safety Quiz.