"The distribution of genetic variants within and among human populations are impossible to describe succinctly because of the difficulty of defining a "population," the clinal nature of variation, and heterogeneity across the genome (Long and Kittles 2003)."

This is completely f'n stupid...

http://blogs.discovermagazine.com/gnxp/2010/12/to-classify-h...

[edit]

BTW, I find it funny that you're wiki-scholaring using old sources that date back to before we learned all non-african humans have some neanderthal dna in them.