Yes, that's a good question. I think you're addressing the ergonomics and comfort of the 6 areas. In fact, I think it's one of the most important areas, because if people are not willing to wear you kind of get started. It's not just the weight; it's the balance on your head, balance on your ears. There has to be comfort to wear. That's the most important thing. Another thing that's very important, you have to be willing to wear. You have to look good on you. It's just not just the comfort alone, it has to look good -- or look in some way, look familiar, you don't want to look odd. All those things are again subtle, and, of course, also it depends on your application. In the case of industrial application like the Motorola's HC1, those are to really perform a task. You fix, check engine, you try to catch a criminal. In this case, both comfort and look are not as important. But in the case like Glass for consumers, it becomes very important. So all this tells me that it tells us that the ergonomics is very important, also it tells you that the weight is a very important like you mentioned. So the optics, everything -- it's, actually, everything, electronics, every packaging had to be very lightweight. If you have gone to CES see our Golden-i, it was more than 3.8. It's extremely lightweight. It's made out of magnesium. You plan to have it extremely comfortable. And that's really, in many ways, a game changing. So to answer your question, yes, it's very important. We knew about this for a long, long time. We've worked with the military. We've worked with Motorola. We've worked with other companies. And we're very trained to how to solve the problem.