Today in Chemistry my teacher was talking about Mercury, and said that it was bad because your thoughts and nerve-impulses are electrical, and that if you have alot of spare metal floating around your body the signals get all messed up. I asked "What about Iron, that's a critical component of our blood", and he explained that away becuase the Iron is in your red blood cells, not just floating around. But it still doesn't seem to make sense that Mercury should be so harmful to you. I mean, calcium, sodium and potassium are technically kinds of metals, and we eat those all the time. No one ever warns people not to touch copper or gold or silver etc., and those are more traditional metals. There has to be some other kind of reason that Mercury is so bad for you besides just being a metal. Does anyone have any idea why?