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Question 100.55K May 29, 2019 0 Comments

How do glass companies know how to mold an hourglass to have the sand fall precisely?

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Answer 1 · 2019-05-29T21:43:05+00:00

Anonymous Posted May 29, 2019 0 Comments

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How do glass companies know how to mold an hourglass to have the sand fall precisely?