When awed by the aura of science, most people, scientists and non-scientists, have never seriously thought about what science really is and what the limit of science would be. Even philosophers, who are supposed to offer answers to questions of this kind are generally very confused about what science really is. This confusion itself is not a trivial matter as many scholars might have thought so, because of the crucial position of science in the civilization, which is indeed the source of the erroneous exaggeration of the role of science beyond its true nature.