Contents

03 April 1992
Vol 256, Issue 5053

About The Cover

This computer visualization of global stratospheric ozone levels for 1 October 1991 highlights the Antarctic ozone hole (thin, dark blue region on lower globe). Powerful computer models are heating up research climates in molecular biology, chemistry, materials science, physics, and math—see the 19-page special report (page 44) and Bell's Perspective (page 64). [Image: Lloyd A. Treinish, using IBM's POWER Visualization System on data from NASA/Goddard's National Space Science Data Center]