Measuring Newton's constant of gravitation is a difficult task, because gravity is the weakest of all the fundamental forces. An experiment involving two simple pendulums provides a seemingly accurate but surprising value.
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Davis, R. Big G revisited. Nature 468, 181–182 (2010). https://doi.org/10.1038/468181b
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DOI: https://doi.org/10.1038/468181b
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