A foot note in Scale, Geoffery West:The full quotation from Einstein is worth repeating because it emphasizes a central dictum of science:"Propositions arrived at by purely logical means are completely empty as regards reality. Because Galileo saw this, and particularly because he drummed this into the scientific world, he is the father of modern physics, indeed of modern science altogether."Taken from Einstein's "On the Methods of Theoretical Physics," Essays on modern Science (New York:Dover, 2009) 12-21