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It is a curious paradox that we think of the physical sciences as hard, the social sciences as soft, and the biological sciences as somewhere in between. This is interpreted to mean that our knowledge of physical system is more certain than our knowledge of biological systems, and these in turn are more certain than our knowledge of social systems. In terms of our capacity of sample the relevant universes, however, and the probability that our images of these universes are at least approximately correct, one suspects that a reverse order is more reasonable. We are able to sample earths social systems with some degree of confidence that we have a reasonable sample of the total universe being investigated. Our knowledge of social systems, therefore, while it is in many ways extremely inaccurate, is not likely to be seriously overturned by new discoveries. Even the folk knowledge in social systems on which ordinary life is based in earning, spending, organizing, marrying, taking part in political activities, fighting and so on, is not very dissimilar from the more sophisticated images of the social system derived form the social sciences, even though it is built upon the very imperfect samples of personal experience. In contrast, our image of the astronomical universe, or even if earths geological history, ca easily be subject to revolutionary changes as new data come in and new theories are worked out. If we define the security of our image of various parts of the total system as the probability of their suffering significant changes, then we would reverse the order for hardness and as the most secure, the physical sciences as the least secure, and again the biological sciences as somewhere in between. Our image of the astronomical universe is the least secure of all simply because we observe such a fantastically small sample of it and its record-keeping is trivial records of biological systems. Records of the astronomical universe, despite the fact that we learnt things as they were long age, are limited in the extreme. | 
