I move swiftly but do not tire. I can illuminate a dark room but am not a bulb. What am I?

Category: Science · Difficulty: medium

Hint: Consider the fundamental particle of light.

Answer

A photon of light

Explanation

A photon is a particle that carries light energy and travels quickly.

This is a medium science riddle — a moderate challenge for most people. The answer is A photon of light.

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