Let me introduce to you the Miniman M-702 Germanium Radio. According to Wikipedia, “Germanium is an important semiconductor material used in transistors and various other electronic devices. Its major end uses are fiber-optic systems and infrared optics, but it is also used for polymerization catalysts, and in electronics and solar cell applications. It is finding a new use in nanowires.” As an element, it didn’t really come into its own until after WWII when it became an important component in the manufacturing of electronics. This particular radio was produced circa 1950’s or 60’s in Japan. These radios are still readily available on ebay and elsewhere. Check out this great flickr set of other germanium radios. And this one. And while you’re at it…these are amazing!