Lesley Stahl on how becoming a grandmother "jolted" her

In this snippet of her new book, "Becoming Grandma," the "60 Minutes" correspondent chronicles the life-changing moment her first grandchild was born

From: http://www.cbsnews.com/news/lesley-stahl-on-new-book-becoming-grandma-the-joys-and-science-of-the-new-grandparenting/