U know what is cool, human eye's sclera is white making it easier to know where a person is looking and to trust them. As opposed to gorillas you never know if they eying u to maul ur head.
> Out of the 60 western lowland gorillas they considered, only 30% had completely dark scleras. The remaining 70% had some degree of white in their eyes. Of these, a small sample of 7% had all white, human-like sclera.
http://www.bbc.com/earth/story/20150808-gorillas-with-human-...