It's said that our eyes are the mirrors of our souls, so it makes sense that eye color is often romanticized. Van Morrison waxed poetic about a brown-eyed girl, while Eric Clapton sang about a woman ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. For most of human history, green eyes didn’t exist.

You're introduced to someone and your attention catches on their eyes. They might be a rich, earthy brown, a pale blue, or the rare green that shifts with every flicker of light. Eyes have a way of ...