One should also, on occasion, take a look at the research of those who oppose the idea of genetic influence on IQ. For example,  by Dickens and Flynn. It was published aside  from Jensen and Rushton, and  from Dickens and Flynn. It is an interesting read, to say the least. Steve Sailer also provides .  For those too lazy, I shall give a quick summarization. The article itself purports to show that the Black IQ has grown steadily closer to the White IQ, and uses the results of several tests to demonstrate. In their conclusion, they report that their results show definitive proof that the idea of genetically determined IQ is invalid, as blacks have decreased the gap.  The rebuttal makes several points, the only one worthy of emphasis is the issue of age, as the data provided by Dickens and Flynn was from younger blacks.  In their counter-rebuttal, Dickens and Flynn concur that the gap has remained intact at 1.1 SDs for adults, but has decreased for youths. In the conclusion of their rebuttal, they deviate from the notion they expressed in their original paper that Blacks have gained 5 or 6 IQ points on whites over the last 30 years, instead stating that Today, the IQ gap between young blacks and whites is far less than 1.1 SDs, thereby very subtly changing their data from being applicable to all blacks, to only those of the age-range tested, and thus wholly undermine their conclusions from the original article.  As Steve Sailer points out, such IQ results match the idea trumpeted by Rushton and Jensen that IQ is largely heritable, and that the influence of genes on IQ is variable on age, reaching maximum effect in early adulthood. Thus the results show that cultural influences are working in favor of blacks and increasing the IQs of their children until genes come along and bring them back down to the 1.1 SD gap that has remained constant for a century. or maybe is the generations of crappy educational system that's dumbing down whites? :rolleyes:    When you have to lower the educational system so a negro is able to achieve...., let's just says it stops being a challenge to whites... :D