Clock Comparison Yields Clues to 'Constant' Change

Years of comparisons among the world’s best atomic clocks—based on different atoms—have established the most precise limits ever achieved in the laboratory for detecting possible changes in so-called “constants” of nature. The comparisons at the National Institute of Standards and Technology may help scientists test the latest theories in physics and develop a more complete understanding of the history of the universe.

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<p><a href="http://www.physorg.com/news90776642.html">Clock Comparison Yields Clues to 'Constant' Change</a></p> <p>Years of comparisons among the world’s best atomic clocks—based on different atoms—have established the most precise limits ever achieved in the laboratory for detecting possible changes in so-called “constants” of nature. The comparisons at the National Institute of Standards and Technology may help scientists test the latest theories in physics and develop a more complete understanding of the history of the universe.</p>