> Do you have a single source to back up these claims? I have many. You should start with these: https://www1.udel.edu/educ/gottfredson/30years/Rushton-Jense

> Do you have a single source to back up these claims? I have many. You should start with these: https://www1.udel.edu/educ/gottfredson/30years/Rushton-Jensen30years.pdf https://www1.udel.edu/educ/gottfredson/30years/Rushton-Jense... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270739/pdf/mp2014105a.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4270739/pdf/mp2...