Noted Norwegian adventurer and ethnographer Thor Heyerdahl discusses his most recent book "The Tigris Expedition: In Search of Our Beginnings" in which Heyerdahl and a crew of 10 men built a reed boat in Iraq and sailed it through the Persian Gulf, around the Horn of Africa, to Pakistan and eventually the Red Sea. Their goal was to prove that the ancient peoples of Mesopotamia and the Indus Valley could have been in contact through marine trade and migration.