Mercury yields best measure of a second so far.
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References
OskayW. H., et al. Phys. Rev. Lett., 91. 020801 (2006).
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National Institute of Standards and Technology
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Brumfiel, G. Atomic clock clocks in at record time. Nature (2006). https://doi.org/10.1038/news060717-9
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DOI: https://doi.org/10.1038/news060717-9