The A B C of Relativity

Russell begins by explaining the basic concepts of space and time and how they are related to each other. He then introduces the principle of relativity which states that the laws of physics are the same for all observers in uniform motion relative to each other. This principle leads to some counterintuitive consequences such as time dilation and length contraction which Russell explains in simple terms. Russell also discusses Einsteins famous equation E=mc² which shows the relationship between energy and mass. He explains how this equation led to the development of nuclear energy and the atomic bomb.