Self-driving cars may sound like science fiction but they're already hitting the road for research as carmakers and tech companies race to develop the potentially life-saving technology. Bill Whitaker goes to Silicon Valley to take a ride; A Kennedy son breaks the silence about his and his family’s alcoholism in an effort to help others overcome their own addictions. Lesley Stahl reports; They lie in unmarked mass graves throughout the former Soviet Union, forgotten victims of the Holocaust whose stories haven't been told. Lara Logan reports.
