MP Materials has soared 250% on the year. Can this mining company match -- or, indeed, exceed -- the performance of tech giant Nvidia?Right now, in your smartphone or laptop, is an incredibly strong magnet made from rare-earth metals. In fact, wherever there is a motor or speaker near you, whether it's a car door or a kitchen blender or an electric vehicle (EV), there's very likely a strong magnet in it.The sheer ubiquity of these magnets makes them a critical component of today's world. And MP Materials (M ...