How the U.S. accidentally raised the IQ of an entire generation

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Nearly a hundred years ago, the United States solved a major public health crisis, goiter, by iodizing salt. Surprisingly, it also led to a 15-point jump in IQ. What can this tell us today about how we should respond to toxic substances like lead?

This story was originally published by Grist with the headline How the U.S. accidentally raised the IQ of an entire generation on Nov 7, 2019.