The author points out something he may not have even intended: that parenting might not matter at all, despite the raging discussions about which parenting style is better.

In fact, lots of research on twins and adopted children suggests that parenting matters very little in shaping a child's personality and skills, while biology and peer groups matter a lot. Identical twins turn out quite similar regardless of whether they grow up in the same family, while adopted siblings are as different as any random people. (Check "How the Mind Works" by Pinker for a great overview.) People have a hard time accepting this, since most would like to believe that they have a power to shape their children, but this does not make it any less true.

> the Immigration Act of 1965... didn't just abolish racial quotas, it also created preference categories for science, math and engineering-trained immigrants to come over.

Ah, so Asian immigrants to the US are far from an unbiased sample of their original populations! This explains a lot more than bitter fights over parenting.