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Furthermore, Lynn and Becker's 2018 national IQ intelligence scores (labelled "Intelligence" in pic related https://x.com/cremieuxrecueil/status/1793408297648959738/photo/1) correlate almost perfectly with international intelligence scores found by many other sources including student achievement investigated for the world bank by Angrist et al https://www.nature.com/articles/s41586-021-03323-7 , NAtional IQ scores collected by Lim et al https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)31941-X/fulltext , student achievement and basic skills by Gust et al for the institute of labour economics https://docs.iza.org/dp15648.pdf and adult ability PIAAC survey done by the OECD https://www.oecd.org/en/publications/skills-matter_9789264258051-en.html

So clearly Lynn's results finding that third worlders are LOW IQ match multiple other international assessments of cognitive ability performed by by international organisations like the World bank, OECD, institute for labour economics and others.

https://x.com/cremieuxrecueil/status/1793408297648959738/photo/1