Francis Ferrari, a French ophthalmologist, invented a controversial procedure that can change eye color. People from around ...

How does a stripy tree snail hide from hungry birds? The Hypselostyla camelopardalis from the Philippines and Reinia variegata from Japan have both evolved a form of dynamic camouflage to survive.

Color-changing mood rings, forehead fever strips and car-shade indicators all change hues as they warm and cool, thanks to a ...