This work is a collection of research related to physiological fluid dynamics, an interdisciplinary field developed through the interaction of scientists working in engineering, medicine and sciences. In the past, such an interaction has resulted in a strengthening of our knowledge in functional aspects of various biological and physiological systems as well as developments of devices which have helped alleviate suffering. This contributed volume is of value to clinicians with an interest in cardiovascular blood flow, to experimentalists and to those theoreticians with a keen interest in developing new analytical procedures. The book presents an account of the most exciting developments in astrophysics and cosmology, with contributions from internationally acclaimed scientists such as Hewish, Kibble, Penrose, Narlikar and others. It surveys major areas that form the core of active research in this subject today and should be of great value to young workers beginning research in this field, as well as more experienced practitioners of this discipline.