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More than a million Americans are infected with HIV, the virus that causes AIDS. Find out more about HIV and AIDS by taking this 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: Colorectal cancer—cancer of the colon or rectum—is the second leading cause of cancer death in the United States.

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.

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.

Fluoroscopy is a type of imaging tool. It looks at moving body structures. It’s much like an X-ray "movie."

An electrocardiogram (ECG) is one of the simplest and fastest tests used to evaluate the heart. Electrodes (small, plastic patches that stick to the skin) are placed at certain locations on the chest, arms, and legs. When the electrodes are connected to an ECG machine by lead wires, the electrical activity of the heart is measured, interpreted, and printed out.

A heart transplant is surgery done to remove the diseased heart from a person and replace it with a healthy one from an organ donor.

The Holter monitor is a type of electrocardiogram (ECG) used to record an ECG tracing of the heart continuously for 24 hours or longer.