Like the protagonist in The Truman Show or The Matrix, cosmologist Max Tegmark has discovered that the ultimate nature of reality is not at all what it seems. His new book, Our Mathematical Universe: My Quest for the Ultimate Nature of Reality, leads us on an astonishing journey through the physics, astronomy and mathematics that are the foundation of his work to arrive at his mind-boggling theory of the “ultimate multiverse.” "A game changer. If Dr. Tegmark is correct, this represents a paradigm shift in the relationship between physics and mathematics, forcing us to rewrite our textbooks." – Michio Kaku, author of Physics of the Future