Some animals have perfected the art of hiding in plain sight! From color-changing reptiles to perfectly blended mammals, these 10 U.S. creatures use astonishing camouflage to evade predators and catch ...
Rubies and emeralds have the colors they do because, like many substances, they absorb some colors of light. Most visible light, like sunlight, is composed of all the colors of the rainbow: red, ...
This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to reddish ...