>>509602576Muslim counties have an average IQ of just 81, 7.5 points lower than non-Muslim countries.
Arab countries have an average IQ of just 84.
https://www.researchgate.net/publication/287555828_The_Comparison_of_Mean_IQ_in_Muslim_and_Non-Muslim_Countries
"The Comparison of Mean IQ in Muslim and Non-Muslim Countries" -mankind quarterly. 2010
Skin color is the best biological predictor of IQ.
https://www.sciencedirect.com/science/article/pii/S0160289613000949
"Relationships Between Skin Reflectance and IQ in Japan and the United States" by Donald I. Templer and Hiroko Arikawa