I knew this already and wondered how many others knew this. It's genetics, of course. Not everyone knows it. I get a kick out of shows on TV where both the parents in the show have blue eyes and they use this brown-eyed kid that's supposed to be there flesh n blood. Anyway I know not everyone is dumb. blue+blue=blue and brown+brown=either blue, green or brown, hazel.... and brown+blue=brown or green, blue,etc....I still find this amazing.