Portable atomic clock is the size of a grain of rice.
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References
KnappeS., et al. Appl. Phys. Lett, 85. 1460 - 1462 (2004).
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US National Institute of Standards and Technology
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Marris, E. Tiny timepiece is ultra-accurate. Nature (2004). https://doi.org/10.1038/news040830-1
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DOI: https://doi.org/10.1038/news040830-1