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01/04/2009 05:12 am ET | Updated May 25, 2011

Kristof: How To Raise The World's IQ With Salt

RAWALPINDI, Pakistan: Travelers to Africa and Asia all have their favorite forms of foreign aid to "make a difference." One of mine is a miracle substance that is cheap and actually makes people smarter.

Unfortunately, it has one appalling side effect. No, it doesn't make you sterile, but it is just about the least sexy substance in the world. Indeed, because it's so numbingly boring, few people pay attention to it or invest in it. (Or dare write about it!)

It's iodized salt.

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