re: #8 lostlakehiker

What cultural factor would account for the similarity in test scores of identical twins separated at birth and raised on different continents?

Twin studies are so few and far between, and so statistically variable, as to be basically meaningless.

Nobody doubts there are numerous genetic components to intelligence. It’s obvious; variablility of ability is always going to be partially genetic.

That is not at all going to mean that a ‘race’— which is not a scientific term anyway— is going to have a bias towards being ‘more’ or ‘less’ intelligent.

We don’t even have a coherent understanding of what ‘intelligence’ is. Is it problem-solving? Is it abstract reasoning?

I personally can read a 300 page book in a few hours, and retain almost all of the information contained therin as long as it’s not a techncial subject I know little about. Is that ‘intelligence’ on my part? It certainly has always helped me get very good scores on tests.

And again: twin studies are inherently massively problematic, and using them as support for your argument is never a good idea.