February 2, 2006

Jason Malloy's mega-review of Richard Lynn's new book Race Differences in Intelligence

is now up at GNXP. Lynn, the co-author of 2002's IQ and the Wealth of Nations, is back with a new tome summarizing the results of additional research. He now has summarized 620 different IQ studies from around the world, about four times the number reported in IQ and the Wealth of Nations [Here's the table I constructed of the 168 IQ studies cited in his 2002 book.]. The studies in the new book cover 813,778 tested individuals.

While his last book was organized by country, this one is organized by race. Lynn's new book validates my conclusion about his last one:

Ultimately, though, it is hard to avoid concluding that intellectual and income differences between nations stem to some extent from genetic differences. The results simply cluster too much by race.

This does not mean all differences are caused by genes. For example, I wrote in 2002:

A clear example of how a bad environment can hurt IQ can be seen in the IQ scores for sub-Saharan African countries. They average only around 70. In contrast, African-Americans average about 85. It appears unlikely that African-Americans’ white admixture can account for most of this 15-point gap because they are only around 17%-18% white on average, according to the latest genetic research.

Lynn echoes this, pointing to nutritional shortfalls suffered by Africans as a sizable contributor to their low IQ scores.

Malloy's 13,000 word review is extraordinary. It critically reviews each chapter in the book, evaluates Lynn's arguments, explains where he gets off track (Lynn is 76 years old and far from infallible), and suggests additional data and ideas.

My published articles are archived at iSteve.com -- Steve Sailer

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