Summary: Hands off the Wheel: 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 and take stock of the emerging industry and two of its leaders, Google and Mercedes-Ben. Patrick Kennedy: 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.The Hidden Holocaust: They lie in unmarked mass graves throughout the former Soviet Union, forgotten victims of the Holocaust whose stories haven’t been told. Father Patrick Desbois is determined to find them for history and for humanity. The French Catholic priest takes Lara Logan to some of the sites his work has discovered.