You might say it’s just a pigment of your imagination ...

The colors of the rainbow are all around us, but so are hues that most of us can't see, including ultraviolet — a wavelength that eludes many humans but, surprisingly, many animals can perceive.

Tired of having to reach for your night-vision goggles when you want to track someone’s heat signature after dark? Well, biotech may someday come to the rescue for all of you aspiring spies. Because ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." The human eye does not actually see purple, as purple is not a color on the visual spectrum. Purple is a ...