Contents

22 September 2006
Vol 313, Issue 5794

About The Cover

Cover image expansion

COVER A computer-generated rendering of five mathematical surfaces, depicted as glassy objects on a glass tabletop. This image was awarded first place in the illustration category of the National Science Foundation/Science 2006 Visualization Challenge. All of the winning entries are described in a special feature beginning on page 1729. Illustration: R. Palais and L. Benard