Google's Sergey Brin is building the world's biggest aircraft for luxe vacations (and saving the world)

When you're a cofounder of one of the world's most valuable companies, your passion projects tend to take on a more massive scale than, say, simply tuning up an old hot rod in the garage.

Take Google's Sergey Brin. Word leaked last month that he has a team working on a secret project in the Google-controlled Hangar 2 at the NASA Ames Research Center: a massive airship, or dirigible, which serves as a spiritual successor to one of the hangar's previous tenants, the USS Macon. Sources close to the project claimed that the metal frame of the craft, which looks like a zeppelin, was complete and taking up most of the space inside the hangar.       Read more...