From Teo Leyssen
Michael Brooks writes: “If information is always physical in some way, all physical processes can be seen as a form of information processing,” (31 March, p 30). This seems to me to be false logic, yet a lot about the existence of quantum gravity computers depends on it. “All buses are red” would not mean that “all red things are buses”.
Saint Genest Lachamp, Ardèche, France
