Re: Pictures that make you LOL
Back to awful politics: the European Jews have kept themselves largely genetically isolated from their neighbors for something like 500 years. In India, Castes have remained genetically isolated from each other, even though they lived in the same towns, for more than 2000 years. In Ethiopia there are tribes which have done so for over 5000 years. Those things would sound remarkable, until you look at the genetic data of sub-Saharan Africa, where tribes living as neighbors have remained genetically isolated (almost no intercourse/intermarriage) for millennia. The genetic diversity in sub-Saharan Africa is orders of magnitude greater than in humans in all the rest of the world. The rest of us? So much intermingling of our DNA.
Another crazy, fun fact (no longer Ethiopian related): all humans living outside of sub-Saharan Africa have some small % of Neaderthal DNA (guess there was some intermural hanky panky that went on, 70 (or so) thousand years ago, when the first humans migrated out of Africa into Europe (where Neaderthals lived)). Some of the highest percentage (up to 2%) is in humans located in Australia, a pretty far corner of the Earth (because later waves pushed the earlier ones further and further away).