Explore the philosophical concept of personal identity across space and time in this 50-minute lecture from Yale University's "Death" course. Delve into the metaphysical question of what makes a person the same individual over time. Examine the "soul theory" as a potential explanation for personal identity and discuss its limitations, regardless of whether souls exist. Learn about the train metaphor for survival, the aging of objects, and the concept of space-time worms. Consider the dualist perspective on surviving death through the soul as metaphysical glue. Critically analyze whether the soul is truly the key to personal identity in this thought-provoking exploration of human existence and continuity.