Explore the fascinating world of quantum and classical electrodynamics in this comprehensive lecture by Mauro Antezza at the Kavli Institute for Theoretical Physics. Delve into the macroscopic effects of fluctuations, focusing on Casimir forces and radiative heat transfer. Gain insights into how these phenomena impact the unity of theoretical physics. Discover the importance of cross-program communication in advancing scientific understanding. Engage with complex concepts explained in an accessible manner, designed to bridge knowledge gaps between different scientific fields. Enhance your understanding of theoretical physics and its applications in quantum and classical systems.