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This web site has the following on the web page, "Level of cadmium in the environment." We noticed that the web site also said " Cadmium exposure and human health." It also said " Cadmium is a minor metallic element, one of the naturally occurring components in the earths crust and waters, and present everywhere in our environment. It was first discovered in Germany in 1817 as a by-product of the zinc refining process. Its name is derived from the Latin word cadmia. And the Greek word kadmeia. That are ancient names for calamine or zinc oxide." The header had Cadmium as the highest ranking optimized keyword. It is followed by cadmium, Cd, and cd which isn't as ranked as highly as Cadmium. The next words cadmium.ionainteractive.com uses is battery. batteries was included and will not be viewed by search engines.