The Flynn Effect

Steve Sailer reviews James R. Flynn's What Is Intelligence? Beyond the Flynn Effect:

Despite hysterical politically-motivated attacks, researchers into human intelligence have by now produced a coherent and compelling scientific picture, as explained in books such as the 1994 best-seller The Bell Curve by Richard Hernstein and Charles Murray.

With one exception.

For uncertain reasons, all over the world, raw IQ scores have been rising, on average at the rate of about 3 points per decade. Thus, a test performance that a half century ago would have ranked at the 84th percentile (a score of 115) now is only good enough for the 50th percentile (a score of 100).

When IQ test publishers revise and renormalize their exams every decade or two, they have to make scoring tougher to make the mean stay at 100.

This is very strange. One of the more dubious-sounding implications is that if you go far enough back into the past, the average person would have been a complete dolt, and the greatest genius of that earlier age would have been no smarter than George W. Bush...