Children have a higher iq than Adults usually. Black Children generally have an iq much closer to white Children. Then, Black adults or teens do to White adults or teens. Why? Well Blacks are born sooner, they walk quicker, they reach puberty quicker & they also reach menopause earlier. Just like chimpanzees do. Humans are born longer, walk slower, reach puberty later & reach menopause later. Because Humans are so complex it takes longer for our complex brains to develope therefor we are born later & reach puberty later ect. Which is why over time Blacks lag more in iq.
The Mayans had the white long skulled giant bearded go Kukulkan who bestowed civilization on them. When he left children tried to elongate their heads like kukulkan did.