I just so happens one of the topics presented to all mechanical engineering students at MIT in the late 70s was the "aluminum can." Actually, we focused on the Coca Cola aluminum can. More than twenty hours studying a red aluminum can. Bill's video was twelve minutes, but I learned only about fifty times more than I got from the twenty hours at MIT. ******* Bill, I want to try telling your how much I LOVE your video. Bill, I love engineering more than almost anyone could believe. I don't know why I love engineering so much, but usually I kind of hate the way it is discussed or practiced. Your video is a glorious exception. I love how you appreciate the ubiquitous-usually-taken-for-granted. I love how you see ingeniunousness, where mundane is more obvuous.. I love how you make it human, threading in the math that is a lot of what makes engineering something different from other ways making things. I can see excitement in your expression as you explain details right in front of me that I have not seen before. I am thrilled to be part of the same profession as one of yours. You are setting an example I can try emulating as I attempt entering a new phase in my career, where I must reallocate my time from engineering to teach engineering, because the system I am blessed beyond anything I could ever deserve to have been hired to build, according to my math, a system that cannot be built by my efforts alone. So I must teach. And I am scared to death. You have shown me real teaching that would certainly be effective if am able mimic enough of the essential qualities demonstrated in your video. And of course, the substance of what you explain is absolutely fascinating, even breath taking. So again, thank you for for teaching me. It means as much as anything I know.