“...non-reproducible single occurrences are of no significance to science.”

Source: The Logic of Scientific Discovery (1934), Ch. 4 "Falsifiability", Section XXII: Falsifiability and Falsification. p. 66.

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Karl Popper 82
Austrian-British philosopher of science 1902–1994

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Variant translation: In questions of science the authority of a thousand is not worth the humble reasoning of a single individual.
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Variant: In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.
Context: for in the sciences the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man. Besides, the modern observations deprive all former writers of any authority, since if they had seen what we see, they would have judged as we judge.

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