Here are the answers to your questions.

*   **Q1: Who was the third person to walk on the surface of the Moon?**
    *   **Answer:** The third person to walk on the Moon was Charles "Pete" Conrad, Jr. He was the commander of the Apollo 12 mission and was the first to step out of the Lunar Module *Intrepid* onto the Ocean of Storms on November 19, 1969.
    *   **Confidence Score:** 10/10 (Absolutely certain. This is a well-documented historical fact.)

*   **Q2: What was the primary topic of conversation during the first private dinner between Aristotle and Alexander the Great?**
    *   **Answer:** It is impossible to know for certain, as no historical record of this specific private conversation exists. While Aristotle was Alexander's tutor, and they would have discussed many subjects (such as philosophy, ethics, politics, and science), the specific "primary topic" of their first dinner was never recorded and is lost to history. Any answer would be pure speculation.
    *   **Confidence Score:** 1/10 (Highly uncertain. This confidence score reflects the complete lack of verifiable information about the content of that specific conversation.)