Physicists get down to the theoretical limit of precision.
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Higgins, B. L., Berry, D. W., Bartlett, S. D., Wiseman, H. M. & Pryde, G. J. Nature 450, 393?396 (2007).
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Ball, P. The most accurate measurement ever made. Nature (2007). https://doi.org/10.1038/news.2007.242