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• The fallacy of appeal to personal incredulity is committed when the arguer presumes that whatever is true must be easy to understand or to imagine.
• The fallacy seems to be most frequent when the contrasting expert opinions differ from our deeply held beliefs.
• The fallacy is very commonly found in debates over science.
• In a variant of the fallacy, a person may to appeal to her lack of understanding on a subject matter in a seemingly more self-deprecating manner as a backhanded way of undermining expert authority. The steps to avoid committing the appeal to personal incredulity fallacy are rather straightforward.