Contents

23 December 2005
Vol 310, Issue 5756

About The Cover

Cover image expansion

COVER The cover image symbolizes the host of genetic studies and field observations that have shed light on the mechanisms that drive Darwinian evolution. A model DNA molecule is emblazoned with species representing key advances of 2005, including a stickleback fish; the influenza virus; a European blackcap; a chimpanzee; a fruit fly; and three members of Homo sapiens, including Charles Darwin himself. [Photo illustration: Chris Bickel and Kelly Buckheit; images: C. Goldsmith/CDC; W. A. Cresko; David Scharf/Peter Arnold; Andy Bright; Jupiter Images]