In this enlightening session, Prof. Marc Henry delves into the intricate concepts of energy, entropy, and thermodynamics. Starting with a discussion on the complexities of defining energy, he highlights the evolution of scientific understanding from the ideas of Poincaré to Boltzmann and Prigogine. Prof. Henry explores how entropy, often misunderstood, is foundational to understanding natural processes, contrasting it with energy's role in practical applications. The conversation covers key scientific principles, the history of physics, and the relevance of entropy to life and the universe. This discussion will give viewers a deeper appreciation of fundamental concepts that shape our understanding of existence.