True or false: If someone is following your car too closely, you should gently tap your brakes as a warning.

There are millions of pet cats in the United States. Three households in 10 own at least one cat. Sometimes, however, cats can cause an illness called cat scratch disease. Find out more about this illness by taking this true-false quiz.

Ronald Reagan died of Alzheimer's disease. Jacqueline Kennedy-Onassis died of non-Hodgkin's lymphoma. Rock singer Sting has bipolar disorder. When the famous among us get sick, it makes the news, no matter what the illness. Here's a quiz to see if you're up-to-date on celebrities' health, both past and present.

Celiac disease is a digestive disease that can affect children and adults alike. Also known as celiac sprue ("sprue" means you can't absorb nutrients from food), this disease is the most common genetic disease in Europe and is considered significantly underdiagnosed in the United States. Learn more about the disease by taking this quiz.

According to the American Cancer Society, an estimated 3,710 women will die from cervical cancer in the United States during 2005. Death rates are dropping, though, because more women are being screened for it. To learn more about cervical cancer and prevention, take this quiz.

Answer this one: When riding in a motor vehicle, how tall should a child be to sit in a regular seat and use an adult seat belt instead of a being strapped into a car safety seat or booster seat?

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.

Answer this one: What's the optimum age range for learning during childhood?

Answer this one: The STD chlamydia is a bacterium that is transmitted through intimate physical contact. What's the most common means of transmission?

An excess of cholesterol can build up in the arteries, narrowing them and slowing or blocking blood flow to the heart. Take this quiz to learn more about cholesterol and its role in your health.