Ive often wondered this myself - and i tend to agree that something else happened that they havent told the pubic about. be a discovery or something else who knows? could it just be that when they got to the moon, they realised it was actually just boring, so didnt bother anymore? plausable i suppose. more interestingly still, who knows what info will be declassified from the past 7 years that could shed light on this very topic? the next generation could be watching a documentory about the top secret research facility built on the moon that we currently dont know anything about! far fetched? perhaps. but i always recall the two headed dog and monkey head transplants they did in russia during the cold war - something whipped right outta a sci fi block buster, and the public never knew until it was all declassified.