Synthesized answer
The provided passage does not contain information about unanswered questions. It only states the title of the book, its author, categories, and page count [1]. Therefore, I cannot answer what questions remain unanswered based on this passage.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: How I See Philosophy by Friedrich Waismann Categories: Philosophy Pages: 269