Just when you thought you knew every single shade in the rainbow like the back of your hand—buttery yellow, martini green, ...

It turns out that one of the colors we see in the world every single day is actually just a pigment of our imagination — er, sorry, figment of our imagination. Scientists say it's a sort of collective ...

Purple is a combination of wavelengths from opposite extremes of the spectrum, which technically deosn’t make any sense, but our brains evolved a solution. When we “see” a combination of blue and red ...