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

Green is the rarest eye color, according to the American Academy of Ophthalmology (AAO), found in just 2 percent of the world's population. That figure is slightly higher in certa ...

Cat-like eyes show up in searches everywhere. If the internet is this obsessed with eye color, how rare are green eyes in humans? They’re uncommon enough that seeing them still feels like spotting a ...