Curiosity gap
Showing just enough to make the missing piece unbearable, so the click feels like scratching an itch.
See it
What it is
A curiosity gap is the itch you create by showing someone enough to know something is missing. George Loewenstein's information-gap theory (1994) is the underpinning: curiosity spikes when the distance between what you know and what you want to know is small and visible. Zero gap means no reason to click; a huge gap means you do not care enough to close it.
It works on headlines, subject lines, hooks, and the last line before a fold. The mechanics: name a specific subject, promise a specific payoff, and withhold exactly one variable. 'We cut our AWS bill 60% by deleting one line of config' leaves the line unnamed but tells you the topic, the size, and the shape of the answer. Upworthy industrialized this in the 2010s, and then burned it.
Gotcha: the gap is a promise, and the body has to close it fast. If the answer is vague, delayed, or smaller than teased, you have trained that reader to distrust everything you publish next. Withhold the answer, never the subject; a headline you cannot understand without clicking is not curiosity, it is a riddle, and readers scroll past riddles.
Ask AI for it
Write 10 curiosity-gap headlines for [article/product] aimed at [audience]. Each one must name the specific subject and the size or shape of the payoff while withholding exactly one variable (the method, the number, or the culprit). Ban vague teases: no 'this one trick', no 'you won't believe', no pronouns standing in for the topic. Every headline must be something the piece actually delivers within the first two paragraphs. Under 12 words each. After the list, mark the three that would still feel honest to a reader after they finish reading.