EDIT: How it works:
It asks an llm this prompt: "I was going in this rabbit hole of wikipedia articles: #{chain} \n I have now found these topics:\n\n#{related_topics}\n\n Select the 2 most mind blowing topics from the list and that I'd enjoy given my rabbit hole. Ensure two topics are not the same."
and pics two articles that it returns. This is slightly better than random.(related article names are obtained from wikipedia API).