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 ...

For centuries, the saying "Red sky at night, sailor’s delight. Red sky in the morning, sailors take warning" has been used to predict the weather – but is there any truth to it? According to ...