Contents

27 July 2007
Vol 317, Issue 5837

About The Cover

Cover image expansion

COVER Social scientists and computer scientists meet at the intersection of virtual worlds. These virtual worlds, such as Second Life and World of Warcraft, provide new resources and approaches for research in political science, sociology, and economics. See the Review by Bainbridge on page 472. Photo: George Joch/courtesy of Argonne National Laboratory