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wedrifid comments on Rationality Boot Camp - Less Wrong
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Well worth a read, purely for the cognitive enhancement discussion. I've seen (and been interested in) your DNB experiences before but hadn't encountered the iodine supplementation research.
Update: I've written substantially more on iodine at http://www.gwern.net/Nootropics#iodine (Covering background, children/adult IQ studies, meta-analysis, power calculations, and value of information.)
Yeah, iodine is an interesting topic. There's some evidence from Japan (all that seafood & seaweed) that current Western levels are too low and we could get a bit of IQ from boosting iodization, but the really big gains are elsewhere. Some further reading:
(I was actually going to get some iodine for my latest batch of pills, but then Fukushima happened and utterly obliterated the iodine market, obviously.)