The world's most ethnically diverse country may surprise you

I thought this was interesting... "Uganda has the highest ethnic diversity rating" in the world.  The Daily Mail (UK) has a similar article, though they said South Korea is the least ethnically diverse.  The Post lumps the Koreas together, which I think is probably a bit more accurate (who goes to North Korea?).

http://www.washingtonpost.com/blogs/worldviews/wp/2013/05/16/a-revealing-map-of-the-worlds-most-and-least-ethnically-diverse-countries/