Question: Yes / no, is the following a verifiable fact?
"Buzz Aldrin walked on the moon." Let's think first. Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
He and Neil Armstrong were the first two people to land on the moon.
So, the final answer is yes.