Source: cirosantilli/weapon-grade-plutonium-is-cheaper-than-weapon-grade-uranium
= Weapon grade Plutonium is cheaper than weapon grade Uranium
Because you can generate <plutonium-239> from <uranium-238> in a <breeder reactor>, and then separate the <plutonium-239> from the <Uranium> simply by using <chemistry> methods because you've created an element with different valence electrons.
Isn't it somewhat funny that it is easier to purify a synthetic element than a naturally occurring one?