Here's an excerpt from the book. And the book also has a web site.
Sax weighed in on the Larry Summers controversy in the LA Times:
The most important breakthrough [in gender studies] has been the discovery that the various regions of the brain develop in a different sequence in girls [than in boys]. Researchers at Virginia Tech used sophisticated electrophysiologic imaging to examine brain development in 508 normal children — 224 girls and 284 boys — ranging from 2 months to 16 years. These researchers found that while the areas of the brain involved in language and fine motor skills (such as handwriting) mature about six years earlier in girls, the areas involved in math and geometry mature about four years earlier in boys.Posted by Greg RansomThis finding puts much of the previous work on gender disparities in math and science in a different light. Chavez cited a study showing that among young children there are many more boys who are math geniuses than girls. But if girls had the opportunity to learn math at their own pace, the odds are good that we would have many more teenage math geniuses who are girls. Just as many boys are late bloomers with regard to literature and foreign languages, many girls are — or could be — late bloomers with regard to math and science. The real problem is not with the different mental capacities of boys and girls but with the way they are taught. Most girls attend coed schools in which girls and boys study the same subjects in the same sequence. Too often, the result of that kind of gender-blind education is that by age 12 the girls think they're no good at math and never will be. The irony is that many of those girls might be math prodigies, if only they were taught in schools whose curriculum was tailored to the individual ..