How cancer spreads

Cancer of the throat or larynx

From a top view of the voice box (larynx) and vocal cords, this animation shows the formation of a malignant tumor on the right vocal cord.

• Cancer

Reverse crunch with fitness ball

You can do many core exercises with a fitness ball. See the reverse crunch.

Anatomy of Nicotine Addiction

This animation illustrates how smoking changes your brain, causing nicotine addiction.

Humira: An Overview of FDA-Approved Uses and Mechanism

A brief description of common uses for Humira and how it works in rheumatoid arthritis and Crohn's disease.

• Humira

Passing Gas: How to Minimize the Impact

How gas forms, and pointers on how to lessen the passage of flatulence (gas).

• Digestive