The color purple has long been a symbol of royalty, creativity, and mystery. But according to science, it's also something else: a figment of our imaginations. While it looks just as real as red or ...

Though they're so common that we don't typically give them much thought, lights are fascinating elements of the modern world. By sending an electrical current through a conductor, extreme amounts of ...

Many of us develop strong attachments to particular colors, but purple brings out the most focused and enthusiastic devotion. What makes purple so distinctive? Part of the answer comes from optics.