Earlier this week, the U.S. Senate held hearings on a bill to jumpstart domestic production of “rare earth” minerals, in order to break China’s near-monopoly on these little known but essential raw materials... “Rare earth” refers to a collection of 17 elements from the periodic table, with Star Trek-sounding names like holmium, europium, neodymium, and thulium. They tend to be found together, and exhibit similar chemical properties that make them useful — and in many cases vital — for a whole host of high-tech applications, such as superconductors, magnets, and lasers. Rare earths are essential ingredients in many emerging “green”...