Special relativity is often treated as an "extra" in undergraduate courses-a combination of geometric and logical puzzles seemingly intended to make the novice student concede that Einstein was a genius and that the universe is weird. But for physics students, developing a relativistic intuition isn't just a luxury; it's a requirement. Special relativity is absolutely fundamental to modern physics. It is the foundation of electromagnetism, particle physics, field theory, and, ultimately, general relativity. Physicist and popular author Dave Goldberg provides a rigorous but conversational introduction to fill this void in spacetime education. Employing the calculus familiar to university students in science, engineering, and computer science, Goldberg acquaints readers with topics like tensors, the development of new physical theories, and the relationship between relativity and other disciplines. But more than this, Goldberg welcome lifelong learners who may have encountered special relativity in popular accounts but are seeking a mathematical challenge in order to under stand an elegant physical theory.