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Metrology
10.22.2018
By explicitly connecting all base units to fundamental constants, the future reform of the International System of Units (SI) will complete the objectives of universality and stability sought by the...
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,...