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Derpish stupidity 

Paul Ingraham ARCHIVEDMicroblog posts are archived and rarely updated. In contrast, most long-form articles on are updated regularly over the years (see updates page).

“Derp” defined as a Bayesian probability concept: the persistent refusal to update beliefs about what is likely to be true based on new evidence.

The word “derp” originally comes from pop culture, but has come to be used most earnestly in political punditry, referring to the extreme mental ruts characteristic of American right-wing extremists. But derpish stupidity is also rampant in health care, and this more technical definition of what derp has come to mean in politics is a pitch perfect description of how quacks defend their beliefs — namely, with self-serving assumptions that are impervious to contrary data, and are literally decades or even centuries behind biology and medicine.

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