The latest volume in the New York Times best-selling physics series explains Einstein's masterpiece: the general theory of relativity. Physicist Leonard Susskind, in collaboration with André Cabannes, chooses to tackle Einstein's general theory of relativity. Starting from the equivalence principle and covering the necessary mathematics of Riemannian spaces and tensor calculus, Susskind and Cabannes explain the connection between gravity and geometry. They explore black holes, define Einstein's field equations, and solve them to describe gravitational waves. The authors provide vivid explanations that, as Einstein himself has said, are as simple as possible (but no simpler). An accessible yet rigorous introduction to one of the most important topics in physics, General Relativity is essential reading for anyone seeking deeper knowledge of the true structure of the universe.