What is it about flying cars? We've wanted to do this for about a hundred years. And there are historic attempts that have had some level of technical success. But we haven't yet gotten to the point where on your way here this morning you see something that really, truly seamlessly integrates the two-dimensional world that we're comfortable in with the three-dimensional sky above us -- that, I don't know about you, but I really enjoy spending time in. We looked at the historical attempts that had been out there and realized that, despite the fact that we have a lot of modern innovations to draw on today that weren't available previously -- we have modern composite materials, we have aircraft engines that get good fuel economy and have better power-to-rate ratios than have ever been available, we have glass cockpit avionics that bring the information you need to fly directly to you in the cockpit -- but without fundamentally addressing the problem from a different perspective, we realized that we were going to be getting the same result that people had been getting for the last hundred years, which isn't where we want to be right now.