Brain‑cell links to intelligence

A very large GWAS of cognitive performance (269,867 people) found not only genetic loci but functional enrichments that point to specific neuronal cell types and synaptic pathways. This moves discussion from whether genetics matter to which brain mechanisms mediate cognitive differences and how robust those mechanistic claims are. — If intelligence can be tied to identifiable brain‑cell types and pathways, it changes the terms of debates over educational policy, predictive testing, genetic enhancement, and research priorities.