In our eighth and final lecture, we investigate four key areas where scientific advances have generated profound philosophical questions. We delve into cosmology and the Big Bang theory's impact on questions of existence, the biological distinction between life and non-life, neuroscience's relationship to consciousness and the mind-brain problem, and the philosophical puzzles arising from quantum mechanics. Dr. Orr demonstrates that scientific progress doesn’t replace philosophy—it deepens it, revealing that the more we discover, the more mysterious the world becomes and the more we need philosophical analysis to make sense of it.