Where did tattooing and piercing originate, and what do they signify? What are the medical risks?

Losing your sense of smell raises your chance of an accident.

Common influenza infects people around the world. What are the dangers of pandemic bird flu, and what can we do to avoid them? What are the roles of vaccines, international cooperation, and national governments?

Brain damage and dementia in Down’s Syndrome resemble damage from Alzheimer’s disease — study could lead to earlier diagnosis for Alzheimer’s.

Embryonic stem cells are the source of every cell in your body. Does researching them violate human sanctity, or is it medicine’s brightest frontier? Should we rely on adult stem cells instead? In this debate, knowledge is power.

The bad news: New science suggests nicotine, not just tar, is the smoking gun in cigarette-related disease. The good news: There are plenty of ways to quit.

Monkeypox, AIDS, SARS: Are more diseases jumping from animals to people, or is it just our imagination?

To battle the bulging waistline, the feds have devised 12 food pyramids to help choose a lifestyle that balances nutrition and excercise. Is this mound helpful?

Research shows that cerebellum regulates the timing of stop-and-start movements, but not for continuous motion. Tap, tap, tap…

West Nile virus attacks birds, but how bad will the human damage be? Where do these viruses come from, how do birds spread them, and how can we protect ourselves?