That northern Europeans are different from southern Europeans, that Ashkenazi Jews are more like southern Europeans than northern Europeans, and that Finns are really strange. From this paper,
European Population Substructure: Clustering of Northern and Southern Populations. Of course, this is Jaakko Tuomilehto. Anyway:
Under a variety of conditions and tests there is a consistent and reproducible distinction between "northern" and "southern" European population groups: most individual subjects with southern European ancestry (Italian, Spanish, Portuguese, and Greek) have >85% membership in the "south" population; and most northern, western, eastern and central Europeans have >90% in the "north" population group.
This is in PLOS Genetics,
so you can read the whole thing for free. Do so. And
then comment!
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Dienekes)