There are millions of people living with Alzheimer's in the United States. In Columbia - there lives a family that may help scientists prevent the incurable disease. Lesley Stahl reports. Bryan Cranston became a household name during his run as Walter White on AMC's "Breaking Bad." The show may have wrapped in 2013 -- but Cranston's career did not slow down. Steve Kroft catches up with him on tonight's "60 Minutes."