The discussion centers on the implications of time travel on causality, questioning whether traveling backward in time inherently violates causal principles. Quantum Field Theory suggests that no violation occurs, as particles appearing to travel backward in time are part of a symmetry in interactions that cancels out probabilities. Closed timelike curves (CTCs) are debated, with some arguing they could lead to causality violations, while others believe future theories of quantum gravity may rule them out. The concept of time is also explored philosophically, questioning its nature and existence. Ultimately, the conversation highlights the complexity of time travel and its relationship with established physical laws.