But the real key question I'm sure that's on your mind: where's the hydrogen going to come from? And secondly, when are these kinds of cars going to be available? So let me talk about hydrogen first. The beauty of hydrogen is it can come from so many different sources: it can come from fossil fuels, it can come from any way that you can create electricity, including renewables. And it can come from biofuels. And that's quite exciting. The vision here is to have each local community play to its natural strength in creating the hydrogen. A lot of hydrogen's produced today in the world. It's produced to get sulfur out of gasoline -- which I find is somewhat ironic. It's produced in the fertilizer industry; it's produced in the chemical manufacturing industry. That hydrogen's being made because there's a good business reason for its use. But it tells us that we know how to create it, we know how to create it cost effectively, we know how to handle it safely.