Contents

03 February 2012
Vol 335, Issue 6068

About The Cover

Cover image expansion

COVER Computer illustration of streams of matter delineating the network of cosmic voids, each tens of millions of light years across. Matter accumulates where the voids meet, forming a cosmic web of walls, filaments, and clusters of galaxies. This illustration was awarded first place in the informational graphics category in the 2011 Science/NSF International Science & Engineering Visualization Challenge. The winning entries are featured in a special section starting on page 525 and at www.sciencemag.org/site/special/vis2011/. Image: Miguel A. Aragon Calvo, Julieta Aguilera, Mark Subbarao