Question: In the mathematical study of cellular automata, Rule 90 is an elementary cellular automaton based on the exclusive or function, call it "the simplest non-trivial cellular automaton", and it is described extensively in Stephen Wolfram's book, released in what year, "A New Kind of Science", Wolfram, a British-American computer scientist, physicist, and businessman?
Sentence (from "Rule 90"): In each time step all values are simultaneously replaced by the exclusive or of their two neighboring values.
Relevant evidence: No