Operators of high-speed rescue boats risk chronic brain injuries

Members of the world's coast guards, navies, search and rescue teams, anyone who regularly operates boats at extreme speeds, are highly exposed to chronic brain trauma - even if they've never hit their head on the job. An ongoing NATO study is trying to figure out exactly how its happening, and what can be done to solve it. The World's Host Marco Werman speaks with Dr. Johan Ullman, who leads the study, about what he's seen so far.