In CUriosity, experts across the CU Boulder campus answer pressing questions about humans, our planet and the universe beyond. This week, Jingchun Li, associate professor in the Department of Ecology ...

Light pollution reduction (LPR) filters work because many outdoor lighting sources do not shine evenly across the visible spectrum. Instead, they emit radiation at only a few distinct wavelengths. For ...

The ability to glow is a mesmerizing trait – but some things can only do so under certain circumstances, for example, having a black light shone on them. So what is a black light, and how do they work ...

What an excellent question, Will! I too wondered about this when I started to learn the wonders of physics. To answer this, we must first explain three things: 1) what is light, 2) what is gravity, ...