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Measurement and the Single Particle

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Science  19 Nov 2004:
Vol. 306, Issue 5700, pp. 1308-1309
DOI: 10.1126/science.306.5700.1308

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Summary

It's a guiding principle in science: to understand something, break it down to its smallest constituent parts. Now metrologists are getting into that game by counting out individual atoms, electrons, photons, or phonons to put their standards on rock-solid foundations.