El Cid: Did you mean...?

In any society, members of the community recognize they are required to restrain certain impulses in order to participate in the community. Every civilization has had some form of law which makes clear that the benefits...

Dr. Josefa Steinhauer explains the history of the first human vaccine and the early days of the anti-vaxx movement. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC...