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    On GPS, World's Longest-Running Lab Test

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On GPS, World's Longest-Running Lab Test

Is it a liquid or solid? Fareed Zakaria looks at Australia's pitch drop experiment, the world's longest-running lab test.

On GPS, World's Longest-Running Lab Test

Is it a liquid or solid? Fareed Zakaria looks at Australia's pitch drop experiment, the world's longest-running lab test.