@FurryFace: I've read that a symptom of arsenic poisoning in humans is darkness underneath the upper arms, and I used to see a few women walk into Walmart wearing sleeveless shirts and they'd have that. We have some waterwells that were really high in arsenic and they got closed down, the campus was using waterwells and had to shut all of them down and go to city water. I lived in the campus apartments for over a decade and I have to wonder how much arsenic is in me.