"Analyzing a concept can (perhaps) tell you what the concept means (at least means to some philosophers), but it does not tell you anything about whether the concept is true of anything in the world."

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Rifkin's assertions bear no relationship to what I have observed and practiced for 25 years ... Either I am blind or he is wrong - and I think I can show, by analyzing his slipshod scholarship and basic misunderstanding of science, that his world is an invention constructed to validate his own private hopes ... Rifkin shows no understanding of the norms and procedures of science: he displays little comprehension of what science is and how scientists work.

— Stephen Jay Gould