Physics
Tyndall Effect
Quick fact
The Tyndall effect is not Rayleigh scattering (which makes the sky blue); it's scattering by larger particles—think of a laser beam passing through a glass of milk or a dusty room.
Why this is interesting
Ever wondered why a flashlight beam looks like a solid cone in fog, or why the sky changes color at sunset? The answer lies in a simple but beautiful phenomenon: the Tyndall effect.