NASA's Apollo-era Mission Control in Houston has been restored to the way it looked 50 years ago when two men walked on the moon, with only a few exceptions. It gets the stamp of approval from retired flight director Gene Kranz, a man for whom failure - or even a minor oversight - is never an option. Seated at the console where he ruled over Apollo 11, Apollo 13 and so many other astronaut missions, Kranz pointed out that a phone was missing behind him. And he said the air vents used to be black from all the smoke, not sparkly clean like they are now.