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                Language Is a Poor Heuristic for Intelligence
 
            
            (karawynn.substack.com)
          
          
          
          
          
        Here are some correlations of language skills and other intelligence factors or evaluations (e.g. IQ) via a study (recently integrated the info into the article: Neurogenetics – language GWAS
However, I largely agree – see for example this argument / its sources
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