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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?

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.

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.

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.

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.

True or false: If you have Raynaud's phenomenon, you will know it because of your fingers and toes change color.

The first sign of shingles is often burning or tingling pain, or sometimes numbness, in or under the skin. You may also feel ill with fever, chills, headache, or upset stomach.

A glenoid labral tear and a torn rotator cuff are just two common injuries that can happen with the shoulder. Can you think of others? Find out how much you know about shoulders by taking this quiz, based on information from the National Institute of Arthritis and Musculoskeletal and Skin Diseases.

Red blood cells are usually doughnut-shaped. In a person with sickle cell anemia, the red blood cells are shaped like a C--like a sickle.