Chronicling the 'resistance movement' against cancer

We have to know the story of cancer, says Dr. Siddhartha Mukherjee, because everyone comes in contact with the disease at some point in life. "Cancer: The Emperor of All Maladies," a new PBS documentary, offers a deep examination of cancer medicine, with signs of hope for the future. Judy Woodruff interviews Mukherjee, author of the book that inspired the series, and executive producer Ken Burns.