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 ...

While violet hits your eye with a specific wavelength, purple only exists in your perception — a clever construct built from ...

Purple is a combination of wavelengths from opposite extremes of the spectrum, which technically deosn’t make any sense, but ...

Look closely at a rainbow, and you’ll spot red, orange, yellow, green, blue, and violet, but not purple. That’s because every color in a rainbow corresponds to a single wavelength of light.

Red, yellow, violet— fire hydrants come in many different colors. But it's not for decoration ... for a 4-story house that's 50 ft by 50 ft and 40 ft tall. Green: 1000-1500 GPM, for a 4-story ...