and it may soon be possible to build permanent magnets as strong as neodymium magnets, but without any rare earth metals. In fact, the only thing needed to make them is iron and nitrogen ...

However, stronger, potentially riskier magnets made from neodymium iron boron (Nd 2 Fe ... two small spherical magnets (diameters, 8 and 12 mm), a necklace with magnets, and a magnetic name ...