Explore the fascinating concept of light's ultimate speed limit in this 28-minute lecture from the series "The Evidence for Modern Physics: How We Know What We Know." Delve into the methods used to measure the speed of light and examine the groundbreaking Michelson-Morley experiment that disproved the existence of aether. Investigate Maxwell's equations and their implications for electromagnetism, and discover how particle accelerators provide further evidence for the constancy of light's speed. Learn about the uniformity of light speed across different wavelengths and gain insights into how this fundamental constant shapes our understanding of the universe. Through engaging explanations and historical context, gain a deeper appreciation for the physics behind light's behavior and its significance in modern scientific theory.