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[–] HoocOtt 0 points 10 points (+10|-0) ago 

The two big thoeries are

Vitmin D absorption in sunnless cloudy ice age Europe

and

White people are attractive

The one i like is a change in hormones and the light skin and eyes are simply knock on effects.

There was a Russian experiment in which they bred foxes for their friendliness.

What happened was unexpected.

They got freindlyness but they also got light eyes and light colored fur.

The friendly hormone mix the Russians bred for also changed their coloring.

https://www.youtube.com/watch?v=-L58NPPQ5eI