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AlwaysChildish t1_irflyqp wrote

Reply to comment by NeedlessUnification in TIL A 2017 study found that the introduction of iodized salt in 1924 raised the IQ for the one-quarter of the population most deficient in iodine. by kstinfo

Awesome answer! Thank you!

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Mysticpoisen t1_irg0oq3 wrote

Also fun fact, the reason both the Midwest and European alpine countries both had such large goiter epidemics is because glaciers had swept those regions, greatly reducing the iodine content in the soil.

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