CORRECTION at 0:29. The text should read, "...people who were exposed to high levels of fluoride had a standardized mean difference in IQ scores which was lower by 0.45 points..." Thanks to audible.com for supporting Healthcare Triage. Sign up and get a free audiobook at http://www.audible.com/triage. Every once in a while chain emails or Facebook posts make their way back into prominence. It happened last year with HPV killing girls. Recently, it seems to be Fluoride. A number of you have been forwarding me a post from last year which features a meta-analysis published a few years ago on Fluoride and IQ. So let's talk about Fluoride! For those of you who want to read more or see references, look here: http://theincidentaleconomist.com/wordpress/?p=58286 John Green -- Executive Producer Stan Muller -- Director, Producer Aaron Carroll -- Writer Mark Olsen -- Graphics http://www.twitter.com/aaronecarroll http://www.twitter.com/crashcoursestan http://www.twitter.com/realjohngreen http://www.twitter.com/olsenvideo