NASA is planning for a 2024 mission to the moon, and setting the stage for a manned mission to Mars. It will be 50 years on Saturday since famed astronaut Neil Armstrong became the first person to walk on the moon. Now, NASA is planning an ambitious launch in 2024 to return astronauts to the surface of the moon, the first time since the Apollo program came to an end in 1972. The plan also includes setting up a sustained human presence there by 2028. Hari Sreenivasan reports from the Johnson Space Center in Houston on the future of American manned space travel.