claim: In the mathematical study of cellular automata, Rule 90 is an abstract cellular automaton based on the exclusive or function, call it "the simplest non-trivial cellular automaton", and it is discussed extensively in Stephen Wolfram's book, released in 2002, "A New Kind of Science", Wolfram, a British-American computer scientist, physicist, and businessman.
supporting_facts.key: Rule 90
supporting_facts.key: Stephen Wolfram