Reality Is Not What It Seems: The Journey to Quantum Gravity

by Carlo Rovelli

the way in which the atoms arrange themselves is correlated with the way other atoms arrange themselves. Therefore a set of atoms can have information, in the technical precise sense described previously, about another set of atoms. This, in the physical world, happens continuously and throughout, in every moment and in every place: the light that arrives at our eyes carries information about the objects it has played across; the color of the sea has information on the color of the sky above it; a cell has information about the virus that is attacking it; a new living being has plenty of information because it is correlated with its parents, and with its species; and you, dear reader, when reading these lines, receive information about what I am thinking while writing them, that is to say, about what is happening in my mind at the moment in which I write this text.