Minerals, facing shortage, are key for military hardware, cell phones. Boeing has signed a deal to deploy remote sensing technology to map out U.S. deposits of rare earth elements. The rare earth family of minerals is the real-life version of the precious element "unobtanium" in James Cameron's movie "Avatar." They are used to make everything from military hardware to humble cell phones, but could soon be in short supply as worldwide demand outstrips mining production in China. The aerospace and defense giant announced today that it will confirm rare earth mining claims held by U.S. Rare Earths, Inc. at locations...