What are the frontiers of today's communications technology? The Age of Electronic Messages explains the scientific principles on which this technology is based and explores its capabilities and limitations, its risks and benefits.In straightforward language accompanied by numerous illustrations, Truxal describes the communications technology that has become such an integral part of today's work and leisure. He provides accounts of the bar codes used in supermarkets and the postal system of the way signals are described in terms of frequencies and in digital form of hearing and audio...

Medical Technology and Society is a thought-provoking examination for nonspecialists of medical technology and the social and moral issues arising from it. The book describes the evolution of medicine from turn-of-the-century general practice with its few surgical techniques and scarcity of effective drugs to today's complex hierarchical delivery systems involving advanced science, sophisticated equipment, and a multitude of highly specialized personnel. The knotty economic and ethical questions that have accompanied this dramatic change are identified and discussed, enhancing our...