I have been able to work part time to coordinate with bringing up my kids. Good question about the royalties. When you think back to your first work at NASA in 1968 did you think you would be working on projects like this now - we mean the technology we have now. In 1968 the major difference was the computers. The difference is that now we can solve differential equations numerically and so design by computer is possible.
Wind tunnels are very limited.
Computer codes can change a number here and there, and so you can see what will happen if you do this instead of that. We love the voice and style in your writing and your good sense of humor. We feel like you are right here in the room chatting with us. And thanks for being able to understand our spelling. I am off to a presentation on a Neptune Planetary mission.