Forget Flying Cars--Last Century's Artists Wanted Whale Buses (and More)

We are seldom more creative than when imagining the future. We like to dream, we like to dream big--and sometimes engineering and science makes those dreams come true. Take Leonardo da Vinci for example. Often the contraptions he drew, such as the famous helicopter-like "aerial screw," were impossible to create, especially considering the materials and technologies available at the time. But almost 400 years later, we have the helicopter--in no small way thanks to the inspirational imagination o...