gwern 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.
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.)