How Adding Iodine to Salt Boosted Americans' IQ

New research finds that iodine played a substantial role in cognitive improvements in 20th century Americans.

The Crux
By Lisa Raffensperger
Jul 23, 2013 8:00 PMApr 7, 2020 4:14 PM
Morton Salt - Flickr
(Credit: trekkyandy/Flickr)

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Iodized salt is so commonplace in the U.S. today that you may never have given the additive a second thought. But new research finds that humble iodine has played a substantial role in cognitive improvements seen across the American population in the 20th century.

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