title: Twin studies, heritability, and intelligence.
authors.forename: S I
authors.initials: SI
authors.lastname: Greenspan
mesh_terms: D002648:Child; D002652:Child Behavior; D006801:Humans; D007223:Infant; D007360:Intelligence / Q000235:genetics*; D007398:Interpersonal Relations; D018433:Twin Studies as Topic / Q000706:statistics & numerical data*; D014429:Twins, Dizygotic / Q000235:genetics; D014430:Twins, Monozygotic / Q000235:genetics