Explore Einstein's revolutionary theory of relativity in this 30-minute lecture from the series "Mysteries of Modern Physics: Time." Delve into the four-dimensional concept of spacetime, challenging traditional views of simultaneity and the present moment. Discover how Einstein's theory redefines our understanding of time as a personal experience, and learn about fascinating concepts like light cones, time dilation, and length contraction. Examine the implications of relativity on our perception of the universe, from the behavior of subatomic particles like muons to the possibilities of time travel. Gain insights into Einstein's conceptualization of space-time and compare it with the Newtonian perspective, ultimately grasping the profound impact of relativity on modern physics and our view of reality.