DNews: How Pain Works

Pain is a pain. Too much of it, and it can really make life hard. But imagine none of it. That can be bad too, as you'd never know if you're hurt. That's the reality for a select few who carry a rare genetic mutation. Trace explains all about pain.



via Discovery News http://news.discovery.com/human/videos/how-pain-works-video.htm#mkcpgn=rssnws1