Thanks. I have read a great deal about human biology and come to understand that there are systems that reliably stop working across such a material percentage of the populationt that something like water fortification of the elements in question could have immense, permanent, positive impact on the residents. And we could likely find a city in the world with concentrations at that level to regress the data and find any lurking downsides. Since Lithium is already in so many water and food sources, and can be clinically significant at dosages of &lt;1000x the pharmaceutical drug, it seemed like a good place to start!