Katie Mack is a theoretical cosmologist and Assistant Professor at North Carolina State University. She’s also a fan of Science Fiction and popular culture. She does a great job of covering the various ways that our Universe, as we understand it at the moment, could come to an end in a few billion or trillion years. Or in the next few minutes. She has a friendly way of talking about the most esoteric and abstract concepts. I was reminded of Sheldon teaching Penny about physics by starting with ancient Greece on a warm Summer evening. We all know a bit…