http://i.imgur.com/aG2WzGh.jpg
So on one side you have workaholic lunatics, superior when it comes to practical things (that's why their Blitz decimated Poland) on the other side you have more mellow people, Slavs. The genetic difference between Poland & Germany is huge. There is a big gap & no overlap (unless they have Prussian ancestry).
http://i.imgur.com/Tz4A8hA.jpg

