I have not voted on it, but if I were downvoting, my reasoning would run that this is a single link which many of us heard about at the time, and Gerard is not providing any context, real commentary, or comprehensiveness, and to some extent, he's focusing on uninteresting things: iodine is way cheaper than parasite prevention, as effective, and comes with nifty bonuses like 'increases the IQ of females more than males'. As well, the appeal to sanity waterline is a little misplaced without any reference to any of the papers I've been collating in http://lesswrong.com/lw/7e1/rationality_quotes_september_2011/4r01 Discussion has low standards, of course, but 1 link and 3 sentences is a bit low.