QUOTE : Some thoughts can arise simultaneously in more than one brain, just as the human species emerged simultaneously in more than one region of the globe. Or is it a case of ideas sliding around within a single brain, shared by certain persons at a particular moment - like that 40,000-tree forest in the north of Canada all joined together, constituting one immense organic being? However that may be, nothing is more disturbing than a thought being expressed by someone else at the very moment it is being born in your head - like the advance, muted echo of a piece of music before the orchestra actually strikes up.