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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.

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

From lightning to the death of electrons, the highest-energy form of light is everywhere.

Light is all around us, but how much do you really know about the photons speeding past you?