David Sanger; Climbing Mt. Everest; Alan Brinkley

David Sanger from The New York Times examines North Korea and United States negotiations regarding nuclear weapons. Peter Hillary and Jamling Tenzing Norgay, the sons of the first men to climb Mount Everest, share their experiences filming a documentary about their own climb to the summit. Historian Alan Brinkley, author of "Voices of Protest," talks about his new role as provost of Columbia University.