What starts as a humble grain yet can stretch across eons and measure your very existence?

Category: Knowledge · Difficulty: expert

Hint: Think about something that marks the passage of time.

Answer

Sand in an hourglass

Explanation

Sand in an hourglass flows to measure time, representing both the fragility and continuity of existence.

This is a expert knowledge riddle — one of the harder riddles here. The answer is Sand in an hourglass.

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