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Introduction
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Seeing the same claim in several places can make it feel well established. Yet those places may all rely on one announcement, one witness, or one earlier article.
Corroboration means finding additional evidence that supports a claim. It is especially useful when that evidence was gathered independently of the original account.
To judge corroboration, follow how each source knows. Count the underlying observations or records that matter, not simply the number of pages repeating the conclusion.