What was the name of Stephen Wolfram's book that referenced Wolfram's 2-state 3-symbol Turning machine?
Wolfram's 2-state 3-symbol Turing machine: In his book "A New Kind of Science", Stephen Wolfram described a universal 2-state 5-color Turing machine, and conjectured that a particular 2-state 3-symbol Turing machine (hereinafter (2,3) Turing machine) might be universal as well. Stephen Wolfram:  He is the author of the book "A New Kind of Science."
A New Kind of Science