I beat without a heart, I signal without sound, I am felt though never found. What am I?

Category: Brain · Difficulty: hard

Hint: Focus on an effect felt physically but not always heard

Answer

A vibration through solid matter

Explanation

Vibrations travel through solids causing sensations without audible sound or heartbeats.

This is a hard brain riddle — a tricky one that takes a little thought. The answer is A vibration through solid matter.

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