> Sinister. A dexterous response, to be sure. ;) I find it interesting that the rates of a whole bunch of these uncommon-but-still-prevalent differences seem

> Sinister. A dexterous response, to be sure. ;) I find it interesting that the rates of a whole bunch of these uncommon-but-still-prevalent differences seem to cluster around 10%. I can't help wondering if it stems from prehistoric humans living in small group of 20-30, so each band would have on average 2-4 of each, giving the group a wider range of capabilities than they would otherwise have.