Yanno, I'd never thought about it, but now that you mention the lithium there (I think the metal and the drug, Stainless, are sorta kinda related in some way. . .
) does make sense. That is --
Lithium is the lightest metal in the periodic table, and so it makes sense that it floated to the highest elevations during the cooling of the liquid earth, right?
Yeah, I thought so. Glad I figgered it out. . .