I am the keeper of moments, but you cannot hold me. I can speed up or slow down, depending on relativity. What am I?
Category: Science · Difficulty: expert
Hint: I am measured in seconds, minutes, and hours.
Answer
Time
Explanation
Time is a fundamental quantity in physics, especially in the theory of relativity where it's affected by speed and gravity.
This is a expert science riddle — one of the harder riddles here. The answer is Time.
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