FBI agents tell Steve Kroft about their 16-year search and eventual capture of Boston mobster Whitey Bulger, once No. 1 on the Most Wanted list. Also, Lesley Stahl has the untold story of a young, American banker's 1975 return to Vietnam to save his stranded Vietnamese colleagues and their families. Finally, volcanoes are found all over the world and many could spew lava and mass destruction -- we just don't know when; Scott Pelley reports.