From early childhood, we’ve been taught to recognize the colors of the rainbow—red, orange, yellow, green, blue, indigo, and violet—using the iconic acronym ROYGBIV. We see them in nature, on color ...

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 ...