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Strontium
10.13.2017
50 years ago, on October 13, 1967, the second—the unit of time—was no longer defined by stars, but by atoms. In this quest for precision, scientists are now inventing the clocks of the future,...
Opinion
10.27.2016
Time can now be measured with dizzying levels of precision, thanks in particular to contributions from the fields of optics and photonics. The quest for ultimate precision, however, is a long-term...