 to impart to them things I think they really need to know. So little moments like that, I think, really led to the book. Well, I want to talk a little bit about your career because it's been so interesting. I mean, a PhD from UMass Amherst, you went to MIT. ROTC was sort of your introduction into service, it sounds like. Can you start at, like, give us the abridged version of how you found yourself, how you were able to become an astronaut? What was it like?