Gray and green eye colors are the rarest in the world. Eye color is determined by the amount of melanin in the iris, with more melanin making eyes darker. A genetic mutation 10,000 years ago caused ...

Add Yahoo as a preferred source to see more of our stories on Google. Not to be dramatic, but this dog’s eyes are giving full-on haunted doll energy. A viral video is making the rounds of a ...

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 ...