I don't particularly want to be Elon Musk -- frankly, I prefer the life I've built for myself. But I think the world could use more people like him, trying to

I don't particularly want to be Elon Musk -- frankly, I prefer the life I've built for myself. But I think the world could use more people like him, trying to effect big positive changes. Social networking technology is lovely stuff, but it doesn't inspire me in the same way as NASA's glory days.