Leading philosophers in science and metaphysics, including Michael Della Rocca and Timothy Maudlin, debate the boundaries of common sense in philosophy. They discuss Parmenides' monistic view, interconnectedness in reality, the objectivity of distinctions, and the simplicity of metaphysical explanations. The conversation explores ataraxia in skepticism, the fear of giving up realist metaphysics, and the intersection of physics, ethics, and metaphysics.