In this episode, we explore chaos and nonlinearity in biological systems with Professor Leon Glass. We discuss what it means for a system to be nonlinear, how differential equations and oscillations help model complex biological behaviour, and how to distinguish deterministic chaos from randomness. Professor Glass shares insights from his journey in nonlinear dynamics, explains how mathematical models reveal hidden structure in physiology, and reflects on education, curiosity-driven exploration, and the patterns that emerge in living systems.