Synthesized answer
The provided passage does not contain information about what questions remain unanswered. It only describes the book "The Sciences of the Artificial" by Herbert Alexander Simon as outlining a program to develop sciences for artifacts [1]. Therefore, it is not possible to answer the question about unanswered questions based solely on this passage.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The sciences of the artificial by Herbert Alexander Simon Description: Outlines a program to develop sciences for artifacts that are usually outside the ambit of natural sciences.