Gray and green eye colors are the rarest in the U.S., although extremely rare red color can occur with albinism. Eye color is determined by the amount of melanin in the iris, with more melanin making ...

I'm not sure I've ever met a kitten I didn't immediately fall in love with. As soon as I laid eyes on both of my cats (who were each just eight weeks old when I adopted them), it was love at first ...

For most of human history, green eyes didn’t exist. Understanding why they do now means rethinking what we know about evolution itself.

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 ...