there was some guy, Eisler maybe, who, in the 60s, scientifically proved that black Americans were 10% less intelligent [IQ wise] than Whites. The fact that it came out amid a period of civil rights movements and right-wing conservative backlashes made him an easy target or inspiration for many. He still maintains that his findings are entirely factual and correct.
Whatever anyone thinks, this raises a very important question. How can anyone even establish what intelligence is, beyond a reasonable doubt? Everyone should question the very level of analysis that aptitude tests, personality tests and IQ tests operate on and, do these numbers actually mean anything? The fact is that these tests have all been made by a section of society, largely an intellegencia who, mostly unknowingly, will bias things one way or another.
Looking at the male/female IQ debate, it’s fairly similar. There are physiological differences but intellegence is identical but aptitudes are different, but environment plays a key role. The point is: it’s stupid to talk in terms of intelligence and more beneficial to talk in terms of ability - which every human has plenty of, regardless of sex or race.
It’s about opportunities, providing everyone has the chance to learn and to be educated, or to develop skills that lets them contribute fully to the world and to participate in it, then this race/intelligence thing will disappear - hopefully.