How Adding Iodine to Salt Boosted Americans' IQ - The Crux | DiscoverMagazine.com:
The economists found that in the lowest-iodine areas—the bottom quarter of the study population—the introduction of iodized salt had stark effects. Men from these regions born in 1924 or later were significantly more likely to get into the Air Force and had an average IQ that was 15 points higher than their predecessors."
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