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A fact so many people believe it that it becomes a fact even if it's total nonsense.
My mom says the sky is blue because she saw it once. Now everyone thinks it's a fact.
The teacher says 2+2=4 because she’s been teaching for 30 years. It’s now a factpinion.
My cousin says aliens live in his basement. Now 10 people believe it. It’s a factpinion.