The gap theory of curiosity
How do you get people interested in a topic? You point out a gap in their knowledge (…) Knowledge gaps create interest. But to prove that the knowledge gaps exist, it may be necessary to highlight some knowledge first. "Here's what you know. Now here's what you're missing." Alternatively, you can set context so people care what comes next. It's no accident that mystery novelists and crossword-puzzle writers give us clues. When we feel that we're close to the solution of a puzzle, curiosity takes over and propels us to the finish.