Core Dynamics is an account of the dynamics at the heart of our planet. The range of subjects reflects the breadth and the fast pace of research in core dynamics. Topics include structure and composition of the outer and inner core, energetics of the core, convection, rotation, flow and turbulence in the outer core, solidification of the inner core, dynamo theory and numerical dynamo models, magnetic polarity reversals, laboratory experiments on the core and the geodynamo and the interactions between the core and the other parts of the Earth.