This is really cool! Kudos! I know CS is a great way to help improve underprivileged kids' economic status. As long as the person has certain kind of "wiring", is willing to work hard, and not giving up easily, it can bring about a bright future. So great to see someone goes extra-mile to bring this "gold-mine" forward. Hope many more people can be blessed by your book. Would love to also buy your book!