These three groups may help debunk the myth of success as a simple product of intrinsic intellect, for they represent three different races and histories. In the debate over nature and nurture, they suggest the importance of improved nurture  which, from a public policy perspective, means a focus on education. Their success may also offer some lessons for you, me, our children  and for the broader effort to chip away at poverty in this country.

Richard Nisbett cites each of these groups in his superb recent book, “Intelligence and How to Get It.” Dr. Nisbett, a professor of psychology at the University of Michigan, argues that what we think of as intelligence is quite malleable and owes little or nothing to genetics.

“I think the evidence is very good that there is no genetic contribution to the black-white difference on I.Q.,” he said, adding that there also seems to be no genetic difference in intelligence between whites and Asians. As for Jews, some not-very-rigorous studies have found modestly above-average I.Q. for Ashkenazi Jews, though not for Sephardic Jews. Dr. Nisbett is somewhat skeptical, noting that these results emerge from samples that may not be representative.

In any case, he says, the evidence is overwhelming that what is distinctive about these three groups is not innate advantage but rather a tendency to get the most out of the firepower they have.

Image Nicholas D. Kristof Credit... Fred R. Conrad/The New York Times

One large study followed a group of Chinese-Americans who initially did slightly worse on the verbal portion of I.Q. tests than other Americans and the same on math portions. But beginning in grade school, the Chinese outperformed their peers, apparently because they worked harder.