I can both speed up and slow down, yet I am not alive. You use me to navigate through life. What am I?

Category: Science · Difficulty: hard

Hint: Consider how we measure intervals and plan events.

Answer

A time measurement

Explanation

A time measurement helps us to quantify periods of time, allowing us to manage our schedules.

This is a hard science riddle — a tricky one that takes a little thought. The answer is A time measurement.

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