Board Thread:Grimm Fanfic/@comment-29777876-20160827162945/@comment-108.46.200.213-20170403031419

Blue eye mutation was 6k to 10k years old and they are all descendants from one individual.

http://www.iflscience.com/plants-and-animals/all-blue-eyed-people-have-common-ancestor-0/

http://www.independent.co.uk/news/science/revealed-first-ol-blue-eyes-is-7000-years-old-and-lived-in-a-cave-9086310.html

MaryLikesGrimm