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I.INTRODUCTION
E.   Metaphors of science
§2. Producing and understanding variation
§This is what was in the bag.  Try to figure out what it is. What do you do?
§Cause the object to behave in different ways .
§This is like science because you produce variation in an object and try to understand the changes you produce. 
§Variation is another way of saying change or difference.
§From all that variation information you can understanding what the object does.