In this episode of "THE BODY," we turn our attention to the bones. You might think of them simply as part of our basic architecture. However, recent research has revealed that our bones serve another, equally important, function. The cells they contain issue health-enhancing messages that flow throughout our body like a virtual fountain of youth and power. And if those messages are silenced, the aging process may accelerate. The cells inside our bones keep our bodies young. Let's explore the amazing role they play.