Human Physiology explains, system by system, the workings of your body. It is intended as an understandable undergraduate-level guide to how the body systems function at a cellular level and how they work together to maintain a favorable environment for your cells. You and your class are invited to use and improve this book!
Control Systems is an inter-disciplinary engineering text that analyzes the effects and interactions of mathematical systems. This book is for third and fourth year undergraduates in an engineering program.
Special Relativity is an introductory text for physics undergraduates and advanced high school students. It is also approachable by the educated layman. It is carefully designed to tackle the physics of simultaneity.