The book "Aspects of Physical Biology" offers a comprehensive introduction to the emerging interdisciplinary field of physical biology, which applies the methods of physics to biological questions. It highlights interactions at the molecular and cellular levels and examines how statistical mechanics contributes to the understanding of biological mechanisms. The content is based on lectures from the renowned Sitges Conference on Statistical Physics, which addresses topics such as biological water, proteins, and their transport and replication mechanisms. The authors, Miguel Rubi and Giancarlo Franzese, present current debates and new experimental and theoretical insights that are of interest to both biologists and physicists. This textbook is a valuable resource for anyone looking to explore the intersections between physics and biology.