Getting older doesn't have to mean getting wider, the experts say. The first step in the fight against flab is knowing your opponent. Take the following quiz to find out how well armed you are.

The nervous system is responsible for our thoughts, our emotions and our movements. The brain, nerves and spinal cord are all members of this important process. How much do you know about the nervous system? Do you know what happens when the system malfunctions? Find out by taking this multiple-choice quiz.

Multiple sclerosis is a disease of the central nervous system, the brain and spinal cord. Its symptoms can range from benign to severe. Find out more about this mysterious illness by taking this quiz.

Today, more women than ever before are giving birth to multiples. What explains the increase through the past decade? Take this quiz to find out.

The most common mosquito-borne disease is dengue. It affects nearly 400 million people worldwide each year. Find out more about mosquito-borne diseases by taking this quiz.

Answer this one: Mercury in its elemental form is relatively nontoxic. In the environment, however, the elemental form of mercury is transformed into an organic form, which is easily absorbed by living things. This organic form, which builds up in the body, is called what?

Fibromyalgia affects millions of Americans, according to the American College of Rheumatology. Women of childbearing age are most likely to have it, but it can affect men and children, as well.

Fats are important to your diet, as are carbohydrates and proteins. Certain types of fats are better for you than others and eating too much of any kind of fat can pack on the pounds.

Don't sit too close to the TV. Don't watch TV without a light on in the room. Don't use over-the-counter eyedrops. Are these statements true? Find out by taking the following quiz.

Which habits can harm your vision? Learn about them by taking this quiz.