The field of physics is filled with fascinating concepts and theories that explain the fundamental workings of the universe. One such concept that holds great significance in the realm of electromagnetism is Poynting's theorem, also known as the law of energy flow. Developed by an English physicist named John Henry Poynting in the late 19th century, this theorem provides a mathematical framework for understanding how energy flows in electromagnetic fields. Poynting's theorem plays a crucial role in various fields, from electrical engineering to astrophysics, and has significant applications in everyday technology. In this article, we will explore 18 extraordinary facts about Poynting's theorem that shed light on its importance and implications. So, let's embark on a journey to unravel the secrets behind the law of energy flow in electromagnetism!