Chances are rather good you've heard the news that you have a thyroid -- but chances are also pretty decent you're not completely up to speed on exactly why you have one. What can your thyroid do for you?
WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
How does a 97-pound weakling become the World's Most Perfectly Developed Man, as Charles Atlas did? Through the sport known as bodybuilding. Here are 10 of the greatest, most well-known bodybuilders to grace the stage.
The heart is one of the strongest muscles in the body. Learn about this extremely vital part of the body.