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Something else to notice is that, just as the eye is exquisitely designed
to enable vision, so too our psychological adaptations are exquisitely
designed to execute their evolved functions. Consider disgust. People
everywhere find certain items disgusting. These include bodily secretions
(vomit, diarrhea), rotting materials (decomposing carcasses, spoiled food),
and certain animals (such as rats, flies, and maggots). Importantly, the list
of universal disgust elicitors compiled by psychologists is virtually identical
to the list of disease vectors independently compiled by epidemiologists –
exactly as we’d expect if the disgust system were an adaptation designed to
nudge us away from harmful microbes.25
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