10/28: Runaway blimp cuts power in Pennsylvania; Ancient artifacts recovered from slave ship
An unmanned blimp that houses a state-of-the-art radar system became detached from its moorings and drifted north through Pennsylvania for hours Wednesday; In an excerpt from this coming Sunday's "60 Minutes," Scott Pelley follows National Museum of African-American History and Culture director Lonnie Burch to Africa hoping to find a shipwreck