There is an old racist meme I remember from the good olde days of not being a blogger.
In it they had 3 brains. One was human and labelled “Caucasian”. Another was labelled “Orangutan” and allegedly simian. And the one in the middle was a mix of both and labelled “Negroid”.
I had a laugh. I had dissected enough people to know that brains were the same inside. But there is a long history of science propping up racism. The most serious proponent was Dr. Mengele. I had a rather interesting life in Prague. One of the books I read was “I was Dr. Mengele’s Assistant”. It is by a Jewish doctor who was spared Auschwitz if he helped out with the experiments. In this he charts the lives he helped save and the lives he could not.