I measure time in cycles without any hands, yet my rhythm is profound. What am I?

Category: Science · Difficulty: medium

Hint: Consider what swings back and forth.

Answer

A pendulum

Explanation

A pendulum measures time through its swings, while a calendar keeps track of days, a stopwatch times events, and a sundial uses sunlight.

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

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