Are We Prepared for Volcanic Disruption?

Air travel in Europe is almost back to normal, although shifting winds have sent plumes of volcanic ash over Scotland and Scandinavia, forcing some airports to close again. Even as Iceland's volcano calms down, damages from this week's eruption continue to mount and so do complaints about the way it's been handled. We hear about volcanoes -- past, present and future -- and learn how to prepare  for volcanic disruptions.