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RunningNumbers t1_irhf8ia wrote

Reply to comment by Happiercalif 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

https://pubs.acs.org/doi/10.1021/acs.est.8b05533#

Historically oceans have been seen as a primary source of iodine I precipitation but apparently there are other sources in the water cycle.

Also ocean precipitation goes far in land. Rain clouds that from into the Gulf of Mexico go well into Canada. They intercept cold fronts coming south and make T storms.

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