rationalskepticism.org

Mr.Samsa wrote:
Indeed, I do remember your posts there. I also disagreed with nearly all of them.

Well, I'm not surprised. Because of your penchant for debunkung, I'm sure you would disagree with Einstein and his Theory of Relativity!
Actually, in a sense I should thank you for egging me on to find evidences you wouldn't disagree with. And indeed I'm ready to submit to your criticism two examples which I believe illustrate quite nicely the interaction of Nature and Nurture in the development of Intelligence.
The first one concerns Italy and the transition from the Dark Ages to the Age of Light also called The Renaissance.
The famous Renaissance historian Jacob Burkhardt in his essay, Civilization of the Renaissance in Italy, writes that the Renaissance was, as an historical event, the transition from medieval times, during which the focus of all life had been religion, to modern times, in which that focus expanded to include learning, rationality, and realism.
This transition occurred between 1300 and 1400, and the works of art and literature produced in Italy between 1350 and 1550 had a profound impact on the development of Europe during the next centuries.
.... the talent and splendor with which the artists and writers, funded by generous leaders, created their masterpieces is astounding. And, in particular, we see that, after a long period during which very few geniuses where found, to an enormous flowering of talents such as Leonardo da Vinci, Raffaello, Michelangelo, Macchiavelli, Galileo etc.
Where did they come from? Certainly not a mutation which would activate the genes of Intelligence. Those genes must have been present in the genetic pool of Italians (Nature) but to have them expressed, favorable conditions were needed (Nurture).

The other example concerns Japanese and theirrecently developped passion for music and particularly violin music.
The Suzuki method has brought forth the high standard musician hidden in many japanese children who indeed became greatly esteemed professional violin players, but, as far as I know, not a single Paganini, yet. This, IMO, is due to the fact that they (probably) lack the gene necessary to become a musical genius.

Now, just to illustrate the fact I have nothing against the Jews, I will bring forward a recent discovery making also the Irish different.
Sequencing Of First Irish Genome

"Everybody knows the Irish are different but, for the first time, a research team from UCD Conway Institute led by Professor Brendan Loftus , identified specific markers.
Indeed, the Irish population is of interest to biomedical researchers because of its isolated geography, ancestral impact on further populations and the high prevalence of a number of diseases.
The researchers used HapMap and previous gene association studies to identify new DNA variants such as insertions/deletions (indels) and single nucleotide polymorphisms (SNPs).
Nearly 200,000 indels and over 3 million SNPs were identified in the Irish genome sequence. Of the SNPs, 13% were novel, potentially including markers specific to Irish ancestry or indicators of disease. In particular, one of the new SNPs interferes with the production of a macrophage-stimulating protein, thought to be associated with inflammatory bowel disease and chronic liver disease.

These findings are a further example of the dramatic importance of mapping the entire genome of as many individuals as possible in view of identifying markers not so much of racial differences but of potentially preventable diseases.