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.

A seizure is an uncontrolled electrical discharge from brain cells that causes mental or physical symptoms. Epilepsy is a group of chronic conditions in which a person has unprovoked recurring seizures. Find out more about epilepsy and seizures by taking this quiz.

Find out more about constipation by taking this quiz.

A concussion is caused by a blow or jolt to the head. It is also called a traumatic brain injury. Find out more about concussions by taking this quiz.

Many people swear by alternative and complementary therapies. Find out more about these treatments by taking this quiz.