American IQ Test Scores Show Recent Declines, According To New Study

IQ scores have been falling, a new study blames schools and nutrition

Are We Getting Smarter?: Rising IQ in the Twenty-First

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American IQ Scores Rapidly Decline: What Is Reverse Flynn Effect?

Study reveals average IQ scores in the United States are declining

IQ, explained in 9 charts - Vox

A Half Century of Student Progress Nationwide - Education Next

Are we becoming more STUPID? IQ scores are decreasing

IQ classification - Wikipedia

IQ, explained in 9 charts - Vox