Many biological phenomena are especially interesting from a physical point of view, and recent developments have made it possible to perform quantitative, 'physics-style' experiments on many different biological systems. In this volume, composed largely of lectures at a summer workshop for students in 1991, many of those emerging problems in biophysics are surveyed, with emphasis on the confrontation between theory and experiment. The topics range from the structure and dynamics of individual biological molecules to the computational strategies of the nervous system.