It is that of increasing knowledge of empirical fact intimately combined with changing interpretations of this body of fact – hence changing general statements about it – and not least a changing a structure of the theoretical system.
With all the knowledge and skill acquired in thousands of flights in the last ten years I would hardly think today of making my first flight on a strange machine in a twenty-seven mile wind even if I knew that the machine had already been flown and was safe.
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The beginning of knowledge is the discovery of something we do not understand.
