 When you're an undergraduate, at least when I was an undergraduate, there are all these wonderful books that explain relativity and electricity and magnetism and quantum mechanics. And you say, oh, this is really hard. And then you study and just immerse yourself in it until finally you can do the problems and take the quizzes and pass them and maybe even do well on them. At that point you say, well, maybe I could possibly go farther and maybe I could discover something myself. You never know when you're at the beginning how far you can go. I think that's one of the lessons that I draw from life. You never know how far you can get until you start and just try. When you enter the forest, you don't know whether there's another side to the forest. You never know if you're going to come out on the other side. But as it happens, here we are. We've had great success. You never know when you start.