Our books, our movies—our imaginations—are obsessed with extra dimensions, alternate timelines, and the sense that all we see might not be all there is. In short, we can’t stop thinking about the multiverse. As it turns out, physicists are similarly captivated. In The Allure of the Multiverse, physicist Paul Halpern tells the epic story of how science became besotted with the multiverse, and the controversies that ensued. The questions that brought scientists to this point are big and deep: Is reality such that anything can happen, must happen? How does quantum mechanics “choose” the outcomes of its apparently random processes? And why is the universe habitable? Each question quickly leads to the multiverse. Drawing on centuries of disputation and deep vision, from luminaries like Nietzsche, Einstein, and the creators of the Marvel Cinematic Universe, Halpern reveals the multiplicity of multiverses that scientists have imagined to make sense of our reality. Whether we live in one of many different possible universes, or simply the only one there is, might never be certain. But Halpern shows one thing for sure: how stimulating it can be to try to find out. _______________________ Paul Halpern is a professor of physics at Saint Joseph’s University and the author of eighteen popular science books, including Flashes of Creation, The Quantum Labyrinth, Einstein's Dice and Schrodinger's Cat, and Synchronicity. He is the recipient of a Guggenheim Fellowship and is a Fellow of the American Physical Society. He lives near Philadelphia, Pennsylvania.  Jacob Barandes is a theoretical physicist and philosopher of science at Harvard University. He did his undergraduate work at Columbia University in physics and mathematics, and then completed his PhD in theoretical physics at Harvard. Dr. Barandes currently serves as Lecturer and Co-Director of Graduate Studies for the physics PhD program at Harvard. He is also an Associated Faculty member with Harvard's Department of Philosophy, as well as a Faculty Affiliate with the Harvard Black Hole Initiative. Dr. Barandes teaches courses on the fundamentals of theoretical physics, classical electromagnetism, general relativity, and the history and philosophy of quantum mechanics. His research publications focus on the foundations of quantum theory, philosophy of science, and quantum field theory. Dr. Barandes also organizes the annual New England Workshop on the History and Philosophy of Physics, in addition to an international seminar series on physics and philosophy of science. For more information and videos of Harvard Science Book Talks, see https://science.fas.harvard.edu/book-talks.