A little history. Apparently during WWII an Australian POW in a Japanese Prison named Cornell, who would have made an amazing hacker, came up with the idea that if you use a Gillette “blue” razor and pencil lead, you can receive radio stations. It works similar to a crystal radio due to the coating they put on this particular razor blade at that time. By touching different parts of the razor you get different frequencies. It was later called a “Foxhole Radio“.