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It has been more than 40 years since singer/songwriter Woody Guthrie died of Huntington disease. He had been misdiagnosed for years—he'd even been labeled an alcoholic. Since that time, much as been learned about HD.

True or false: Shivering is one way the body produces heat.

Lips are for ... talking and smooching and eating. Yes, they're important, but do you know how to take good care of your lips? Take this quiz to find out.

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.

Lymphomas are a type of cancer that affects the lymphatic system. Learn more about non-Hodgkin lymphoma (NHL) by taking this true-false quiz.

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

Cancer can strike any part of the reproductive system, but research has led to better diagnoses, treatments, and a lower chance of death for many of these cancers.

Approximately 14 million people in the United States have rosacea. It most often affects adults between the ages of 30 and 60. Rosacea is more common in women, but more severe in men. Find out more about rosacea by taking this quiz.

Twenty-five percent of all people in the United States with AIDS are age 50 or older. Find out more about AIDS and older adults by taking this quiz.