What accounts for global rise in IQ scores?

When President Donald Trump infamously declared his preference for immigrants from Norway, he was presumably unaware that he had selected one of the few developed economies in the world experiencing a decline in average IQ.

Norway and the other Nordic countries have seen an IQ downturn, admittedly from relatively high levels, even while intelligence measurements in the rest of the world continue their long upward rise.

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A version of this article appeared in the print edition of The Straits Times on March 08, 2018, with the headline 'What accounts for global rise in IQ scores?'. Print Edition | Subscribe