Genetics are a big part of it, like you would expect, but its a bit more nuanced than what we learned in high school biology.

Add Yahoo as a preferred source to see more of our stories on Google. They say that eyes are the windows to the soul. Often, a person's eye color is the first thing we notice about them when we meet ...

Brown is the most common eye color worldwide by a large majority. In contrast, green is one of the rarest eye colors worldwide. The color of the eyes depends on how much melanin the eyes contain.