Katie Elliott, a philosopher at Brandeis University specializing in metaphysics, discusses the intriguing intersections of metaphysics and science. She explains how metaphysical concepts illuminate our understanding of time travel, causation, and free will versus determinism. Elliott breaks down counterfactuals and their role in shaping possible worlds while exploring how these ideas challenge our perceptions of reality. The conversation also touches on the implications of quantum mechanics for decision-making, leaving listeners pondering the complexities of rationality and existence.