One of the pleasures of crystal radio is the satisfaction of using minimal technology to receive radio signals. Crystal radio enthusiasts are great experimenters and thrill in creating "different" designs and packaging them in aesthetically pleasing ways. In my book, I provide a complete introduction to crystal radio. I start with the humble electron, layout crystal radio theory, and finish off designing and constructing a working crystal radio. As with all my "From Scratch" books, I make no assumptions about what you know about the subject. Occasionally, math is involved, but I keep it at the basic algebra level whenever possible. I also use simulation and breadboarding (actual hardware testing) to verify theory. In short, I take the mystery out of crystal radio and open possibilities for the reader to explore radio and electronic subjects beyond the limits of my book.