Contents

27 October 1989
Vol 246, Issue 4929

About The Cover

Lightning over a Colorado night sky. Recent attempts to understand such electrical discharges are motivated by spectacular accidents involving aircraft and spacecraft. Uman and Krider (page 457) describe research on natural and artificially initiated discharges that aims to both clarify the physics of lightning and find new ways of protecting against lightning damage. [Photo by John Deeks, Science Source/Photo Researchers]