The Final Moon Landings

Do you know how many lunar expeditions there were after the first moon landing? Can you name any astronauts besides Buzz Aldrin and Neil Armstrong? Although the first moon landing was impressive, it was just a preview of what later astronauts and technological advances like the lunar rover would do. Guest: Earl Swift, author of "Across the Airless Wilds: The Lunar Rover and the Triumph of the Final Moon Landings"