Most of us have suffered an injury we'd prefer to forget, but lingering scars just won't let us. Watch this video to find out exactly what happens during the healing process that cuases these changes to skin and organ tissue.

Did you know that the biggest organ in the human body isn't the brain, the liver, or even the lungs? It's the skin. Follow along with this short video as it explores the structure of human skin and its amazing ability to...