Why NASA is going back to the moon after 50 years

It won't be cheap, but it is very feasible that tourists could soon be traversing around the moon.  Not only that, there could one day be a permanent human presence there.  That's because in its latest mission NASA's betting on finding enough water on the lunar surface to make it habitable.  Today the Washington Post's space reporter, Christian Davenport on how that could then lead us to Mars.  Featured:  Christian Davenport, reporter covering NASA and space, The Washington Post