Lohrenswald
世界的 bottom ranked physicist
I'm sorry I don't have an imageshack or photobucket account.
Edit: This was the map:
Edit: This was the map:

That's unfair. You have to be a Norwegian to take a qualified guess on that one. So I'll try. Has it to do with language?
So what is it, red is a Swedish dialect?
Prevalence of Bokmål vs. Nynorsk? Or maybe official language per district, respectively.
I have no idea which is which, though.
How close are the two dialects? My first guess was going to be political parties
Is it number of first/highest level of administrative divisions (like provinces and states)?
Ancestry in USA? Largest group in each county?