| I do not see much mystery about the brain gene evolution. In my "unauthorized speculation" and some books that I do not have link for.
As people made use of rivers to grow food they did not have to migrate with the seasons, this gave some of them more spare time to think about things other then just spending all their time hunting, fishing, or gathering viggies. With some working the farms they had many who basically had nothing to do, so they became managers and rulers. Spare time allowed them to think about things, philosophy or how to build cities, and so they used their brain more to create their cities, kingdoms, schools, and governments. That spare time to think is also related to the fact that farming allowed them to remain on one location, while also venturing some trade with other locations for additional items they wanted to have.
The blue eyes must have happened for simular reasons of the white skin, part of the transformitive motion relative to the development of races.
Also vision in humans evolved from seeing things in black and white to seeing colors. Which might be a fairly recent event. People who collect native art from America know that that they always used black, white and red markings. As that is how it always was, the natives said. But it is speculated that the color red was the first color people saw, and that is why it was used. Later our vision evolved so we can see other colors. But I am not sure if that kind of reasoning is very scientific or not. Perhaps a lot of sailing or fishing in the blue ocean resulted in blue eyes? Another guess. |