light

The motion of light depends crucially on the material in which it is traveling. When light passes from one medium to another, an unexpected thing happens: The direction of travel changes. There are many explanations out there for why this happens, and many of those explanations are wrong. In this 14-minute video, Fermilab scientist Don Lincoln explains the reason.

Misty night

At Wilson Hall late one night, the fog creates an interesting glow around the lights on the front steps.

At Wilson Hall late one night, the fog creates an interesting glow around the lights on the front steps.