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.

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

Table of Contents In July 2010, Google changed the color of the AdWords background from yellow to purple. Now, less 7 months after the switch, it appears Google has gone back to the yellow color.

Digital relief glasses, aka blue-light blocking glasses create a purple reflection for most wearers. Here's what to do if it bothers you.