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According to the Touchspin (Design) Chemistry Web site, "Some other sites have more in depth information on chemistry, but I double-dog-dare-you to find anyplace with a better interactive periodic table. None other have the features and capabilities that this one offers." You can check out those features at the tool's FAQ page. When you're done, check out the site's new Biology area and find out what a horsefly's eye - or a pig's gall bladder -- look like under a microscope.