I can be measured but never seen, and I dictate the flow of life. What am I?

Category: Science · Difficulty: hard

Hint: Think about how we track events.

Answer

Time span

Explanation

Time is a measurable quantity that affects all processes, yet it is intangible and cannot be directly observed.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Time span.

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