If you want to get a physicist truly excited, ask about all the math and science involved in the search for other universes. Paul Halpern is professor of physics at St. Joseph’s University and a prolific science writer, and he joins host Krys Boyd to discuss the search for parallel universes and how scientists account for unmeasurable figures in their theories. His book is “The Allure of the Multiverse: Extra Dimensions, Other Worlds, and Parallel Universes.”