Science - From the Latin scientia, meaning ascertained facts and knowledge. Science is the Domain of Facts: The Substance of Truth. The Scientist postulates something.

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The value of science lies in its generalization and relation of fact to fact by means of which the mind builds a universe of sequences and connections, applying these generalizations to the needs of life. . . . The scientist, indeed, has no more right to be a materialist than an idealist. Neither of the foregoing presuppositions is scientific; both are philosophical.   —Ralph Tyler Flewelling