Serious question: Given the mood alerting properties of lithium, are people living here chiller than would be expected (controlling for instance for poverty / SES) ?
Potentially. See "Lithium in drinking water linked with lower suicide rates" [1]. [1] https://www.kcl.ac.uk/news/lithium-in-drinking-water-linked-...
I think I heard that long term usage of lithium has nasty side effects like damaging kidneys, but perhaps not at these very low concentrations.