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

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 ...

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 ...