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Two Ancient Timekeepers
Two Ancient Timekeepers
Two familiar instruments serve the same purpose. One appears to contain plenty of movement, while the other has none at all. What are they?
Two familiar instruments serve the same purpose. One appears to contain plenty of movement, while the other has none at all. What are they?

Which two instruments measure the same thing even though only one visibly moves?
Which two instruments measure the same thing even though only one visibly moves?
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