"Version: 20180701"--Title page verso."A Morgan & Claypool publication as part of IOP Concise Physics"--Title page verso.Includes bibliographical references.1. Interaction at a distance? Rather, the propagation of a field -- 1.1. Static fields perhaps well known -- 1.2. Time dependent fields perhaps less well known -- 1.3. Bibliography2. The messengers of the interactions : the 'quanta' of the …