... earth?—T. Fowler, Snohomish, Wash.ASK THE EXPERTSCOPYRIGHT 2005 SCIENTIFIC AMERICAN, INC.COPYRIGHT 2005 SCIENTIFIC AMERICAN, INC.19 SCIENTIFIC AMERICAN EXCLUSIVE ONLINE ISSUE DECEMBER 2005 MATT ... Croton-on-Hudson, N.Y.ASK THE EXPERTSCOPYRIGHT 2005 SCIENTIFIC AMERICAN, INC.QQ16 SCIENTIFIC AMERICAN EXCLUSIVE ONLINE ISSUE DECEMBER 2005 MATT COLLINSSant P. Singh, a professor and chief ... betweenartificial and natural flavors?—J. Yerger, State College, Pa.ASK THE EXPERTSCOPYRIGHT 2005 SCIENTIFIC AMERICAN, INC.QQ15 SCIENTIFIC AMERICAN EXCLUSIVE ONLINE ISSUE DECEMBER 2005 NINA...