Physicists and vision scientists are lining up behind a provocative claim: the rich color we call purple is not a property of light at all, but a story the brain tells itself. Light in the real world ...

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

JACKSONVILLE, Fla. – Happy “rainbow season”! This time of the year, when we see consistent rounds of early evening showers and thunderstorms, we often see rainbows when the sun starts to descend lower ...