>and were not selected by their environments for long enough to develop significantly different cognitive abilities This is patently false. There are hundreds

>and were not selected by their environments for long enough to develop significantly different cognitive abilities This is patently false. There are hundreds of known genes which are strongly correlated/anticorrelated with above average and exceptional intelligence and are absent or underrepresented among various ethnic groups. Humans left africa some 200k years ago and even if you think thousands of generations of adaptation to drastically different environments before agriculture wouldn't have been enough time for populations to evolve cognitive adaptations, the fact that geographically isolated interbreeding with other homonids occured further suggests a genetic basis for differences in cognition. The modern scientific establishment's denial of race based differences in cognition (not just intelligence, see e.g. warrior gene) is nothing but politically motivated science denialism, and does immense harm to the institution's credibility.