[World Scientific Publishing Co. Pte. Ltd. The Tenth Marcel Grossmann Meeting, On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - The MG10 Meeting - Rio de Janeiro, Brazil (2003.07.20-2003.07.26)] The Tenth Marcel Grossmann Meeting, On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proceedings of the MG10 Meeting - CONSTANTS OF NATURE?