90 Study finds link between fluoride and lower IQ in children. (archive.ph) posted 8 days ago by Mpetey123 8 days ago by Mpetey123 +91 / -1 33 comments share 33 comments share save hide report block hide replies
Because of some combination of fluoride naturally leeching into groundwater from the surrounding rock and pollution from industrial processes. I believe it's more the former than the latter, but don't know for sure.