Henry Louis Gates, Jr.; Spencer Wells; Major Gen. Lute, Pt. 2

Using historical records and DNA analysis, Harvard scholar Henry Louis Gates, Jr. traces his ancestry and that of eight notable African Americans, including Oprah Winfrey, Quincy Jones, astronaut Dr. Mae Jemison, and others. Head of the National Geographic Society's Genographic Project, Spencer Wells, describes using the DNA of indigenous people to trace the ancestry of the human race. In part 2 of this interview, Major General Douglas Lute continues to elaborate on the army's changing role in the Iraq war, and what we're learning from our years of engagement.