Psychology
Adding detail to a story makes it feel more likely, not less
Told that Linda is a philosophy graduate outspoken about social justice, most people rated 'bank teller and active feminist' as more likely than 'bank teller' alone — even though adding a condition can only lower or hold probability, never raise it. Tversky and Kahneman called this the conjunction fallacy: a vivid, specific detail feels truer than a bare statistical fact.