Egyptian blue, one of the world’s oldest synthetic pigments, can appear vivid blue in one sample and grey-green or ...

I have always wondered and the curiosity has finally tugged enough for me to ask... Blue things, specifically dark blue things. My eyes cant focus. I can see everything around it, but dark blue ...

Every other Friday on Morning Edition, the Outside/In team answers a question from a listener about the natural world. For the past few weeks, we’ve been tackling queries on the theme of “blue.” What ...