UPTON, NY—Lasers are intense beams of colored light. Depending on their color and other properties, they can scan your groceries, cut through metal, eradicate tumors, and even trigger nuclear fusion.

Scientists have created a new light-activated ink that can change color on demand. It’s made up of microbeads of different colors that rise or sink in response to different wavelengths of light so ...

A California medical company offering promising to permanently change any eye color to blue has filed for bankruptcy. Stroma Medical Corporation, based in Irvine, catapulted into the national ...