The reference to "one study" is laughable. There are dozens of human studies linking reduced IQ in children to fluoride exposure at levels well within one order of magnitude of those in populations subjected to forced-fluoridation, and many more animal studies confirming the neurotoxicity of fluoride. Timothy's complaint regarding where the fluoride came from is pseudoscientific twaddle, with the individual measurement of fluoride exposure actually being a strength of the study. His complaint regarding "limited information about other possible factors" is pure hypocrisy, because the study in an unusually good job of taking potential confounding factors into account, and certainly much better than the studies the fluoridationists rely on.