 Well, I didn't actually know for sure what the path would turn out to be. When you're eight years old, you don't know what it is. When you're in college, you still don't really know what it is. So the first real taste that I got of what it was to be a scientist was in graduate school where I started in on a research project. And that's where you begin to discover whether you can do something and discover something that's not ever been done before, because that's sort of the essence of science is discovering stuff that's never been known before. So that's where I found that it was pretty hard, pretty challenging, but I might make some progress. And as it happens, the problems that we were working on are partially solvable. You can build stuff that will measure the thing you want to measure. So that's how I got started. Some partial success and some encouragement and some discouragement, but anyway, here I am. So it works.