This course, Modern Physics: From Quantum Revolutions to Relativity, is designed to take you on a journey through the most radical intellectual shifts of the 20th century. By the late 1800s, classical physics, defined by Newton’s laws and Maxwell’s electromagnetism, seemed complete. Physicists believed they had solved the universe. Then came two monumental challenges: the nature of light and the structure of space and time. These mysteries cracked open the foundation of physics, leading to the creation of two pillars of modern science: Quantum Mechanics and Einstein’s Relativity.