Want to clean your refrigerator? All you need is some purple light. Research suggests that violet light could kill bacteria.

I have to admit, this week's What's Up With That? query truly had me stumped. But it turns out blue streetlights are explainable, if not ideal.

Analysis of the samples revealed that over time, microscopic cracks in the yellow phosphor cause the light to turn blue or purple.

Some of the Charlotte region’s streetlights are mysteriously changing color. We illuminate why — and how — some people are seeing purple.

“We’ve identified just under 4,000 lights in the Wichita area that were putting out this blue-purple light,” said Baker. It’s a big number, but he knows it may not be the final count.

Purple, a color often associated with royalty and creativity, isn't a true color of light. Instead, it's a creation of our brain when it perceives a combination of red and blue light. This occurs ...

And since light being reflected by objects is what gives them a color, some think this means that the color pink doesn't really exist.