**Answers:**

1. **Who was the third person to walk on the surface of the Moon?**  
   The third person to walk on the Moon was Pete Conrad.  
   Confidence score: 9/10

2. **What was the primary topic of conversation during the first private dinner between Aristotle and Alexander the Great?**  
   The primary topic was likely philosophy, as Aristotle, known for his philosophical teachings, tutored Alexander.  
   Confidence score: 6/10