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Introduction of iodized salt in 1920s….

By WeRaven | July 16, 2021
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Introduction of iodized salt in 1920s increased national IQ average by 3.5 points in a decade and in certain states which had high levels of iodine deficiency previously, saw avg IQ increase as much as 15 points within the first decade.

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Category: Crazy Facts Tags: crazy, Facts, iodine deficiency, iodized salt, iq
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