Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "How I See Philosophy." The passages only state the title of the book and its author [1]. Therefore, it is not possible to answer this question using the given text.
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