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Re:The lactose-tolerance mutation by jeffool on Sunday October 28, 2012 @11:49PM (#4711020)
I consider Wikipedia a good source for conversational information, and to that effect: http://commons.wikimedia.org/wiki/File:World_map_of_lactose_...

Actually, a little more looking, I think I also found the Yale study it's from. Here's the power point: http://cst.yale.edu/sites/default/files/worldwide distribution of lactose intolerance, madison 2010.pptx

Re:The lactose-tolerance mutation by Evbn on Monday October 29, 2012 @12:59AM (#4711172)
Seeing the extreme gradients at national borders in that map, I am inclined to call shenanigans on that map. It appears to be wildly overgeneralized.