Presents a timely, multifaceted examination of electromagnetic fields, including the physical characteristics of environmental electromagnetic fields, intrinsic biological fields, health-related risks, therapeutic applications, and transduction mechanisms. Examines the signal-to-noise problemof biological effects due to low-intensity electromagnetic fields. Describes the biochemical and biophysical mechanisms of interaction of electromagnetic fields with cells. Proposes a mechanistic chain of causality which links the physical transduction to cellular processes.