That's because, even though those colors exist, you've probably never seen them. Red-green and yellow-blue are the so-called "forbidden colors." Composed of pairs of hues whose light frequencies ...

So the sky isn’t blue, at least not always. It is a glow-in-the-dark night sky too, colored a mix of green, yellow, and red. Its colors result from scattered sunlight, oxygen, and sodium from ...

Almost all TV remote controls have red, green, yellow, and blue buttons. However, most people are unaware of what these four colored buttons do. You've probably noticed that almost every remote, ...

A red triangle was once ... were given green triangles. Jewish people were given yellow triangles arranged to form the Star of David. The top triangle in the star could be another color to mark ...

The framing of the characters had them stand just a tad off-center, and space for another character was instead taken up by a tub of green paint despite the wall having very little green on it.

An avid stargazer may notice that apart from the gleaming white stars that sprinkle the night sky, there are red, yellow, blue and orange stars. However, what you'll never see are green stars. Why is ...

So the sky isn’t blue, at least not always. It is a glow-in-the-dark night sky too, coloured a mix of green, yellow and red. Its colours result from scattered sunlight, oxygen, and sodium from ...