THE COST OF DYING - Many Americans spend their last days in an intensive care unit, subjected to uncomfortable machines or surgeries to prolong their lives at enormous cost. Steve Kroft reports Andy Court is the producer. Watch a preview WITNESS - Recently freed after four months of interrogation and torture at the hands of the Iranian Revolutionary Guard, Newsweek reporter Maziar Bahari tells his story to Bob Simon and writes about his ordeal in the next issue of Newsweek. Michael Gavshon and Drew Magratten are the producers. Watch a preview CAMERON'S AVATAR - Morley Safer gets the first broadcast look at how "Titanic" director James Cameron created his $400 million 3D fantasy "Avatar." David Browning is the producer. Watch a preview