Physics, cosmology, and the ultimate nature of reality. Is our Universe infinite—or finite, but wrapped in higher dimensions? Janna Levin, renowned theoretical physicist and science communicator, explores bold ideas about the cosmos: the possibility of a finite universe, the nature of extra dimensions, and how abstract mathematical truths might constrain the physical world. In this wide-ranging conversation, Levin considers whether the Multiverse is physics or metaphysics, whether the laws of physics are fixed or contingent, and if the universe is fine-tuned for life. Could the Big Bang have been just one of infinite cosmic bounces? Are the deepest truths of existence determined by necessity, chance, or brute fact?