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Gemmabeta t1_irf6z1q wrote on October 7, 2022 at 4:43 PM

Reply to comment by adamant2009 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

It's not so much that everyone got smarter as we've managed to eradicate an extremely serious cause for profound mental retardation (congenital hypothyroidism).