Original sentence: Blacks have an IQ score of about 85 in the United States and 70 in sub-Saharan Africa.Both culture-only (0% genetic–100% environmental) and hereditarian (50% genetic–50% environmental) models have been proposed to explain the racial differences in average intelligence
Edited sentence: Blacks have an IQ score of about 85 in the United States and 70 in sub-Saharan Africa, according to two controversial psychologists, J.Philippe Rushton and Arthur R