"... a fact or datum, by itself, is essentially meaningless; it is only the interpretation assigned to it that has significance. Thus, for example, one can literally see the rotation of the earth on any starry night; it has always been patently visible, but for millenia human beings did not know how to understand or interpret what they were seeing. Examples of such misinterpretation, which have retarded the development of science by centuries, can be multiplied without end in the history of science; in all these cases, it was the absence, not of data, but of imagination that created difficulty."

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