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Nature 440, 1094-1095 (27 April 2006) | doi:10.1038/4401094a; Published online 26 June 2006

Shifting constant could shake laws of nature

Mark Peplow

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Proton–electron mass ratio may be on the move.

From the speed of light to the charge on an electron, the fundamental constants of physics had been assumed to be immutable. But that comfortable assumption is being challenged.

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