Take the relationship between race and IQ as a given. This means that it would be extremely unlikely that the national language of a group would not reflect the average intelligence of that group, just as the language used by the more intelligent differs from the language used and understood by the less intelligent. This interests me as a student of Ancient Greek. Talking to others, most people seem to think that foreigners just say the exact same things using different sounds in other languages. I think this is not true. I think there must be differences in what can be expressed between languages, and that the differences are not just cultural, but related to group IQ. My evidence for this is the use in English almost exclusively of Greek and Latin words (however mangled over time by the Gauls, Norse, and Saxons) for abstract concepts.