Uranium comes in several flavors. There's plain old-fashioned yellowcake powdered uranium concentrate. There's low-enriched uranium, whose natural uranium-235 content of 0.7% has been increased to 3% to 5% concentration, so that it can be used in a nuclear power plant. There's even high-assay low-enriched uranium (HALEU) with a U235 content increased past 5% -- as high as almost 20% -- for use in the new generation of high-efficiency small modular reactors. Then there's highly enriched uranium, with U235 ...