IQ scores have decreased in the US for the first time in decades, new research from scientists at Northwestern University and the University of Oregon suggests. The future may not be as bright.

A reader emails me: Twice now you have asserted that your “… read of the evidence is that the black-white IQ gap is almost certainly accounted for by environmental factors.” Would you please ...

A rumor circulating online as a screenshot of a Reddit post claimed U.S. Vice President Kamala Harris received a score of 78 on an IQ test while attending Howard University.

The second- and third-highest ranking are New Hampshire and North Dakota, with state average IQ scores of 104.2 and 103.8, respectively. Mississippi ranked last, with an average IQ of 94.2.