" Mysteries are powerful, Cialdini says, because they create a need for closure. “You’ve heard of the famous Aha! experience, right?” he says. “Well, the Aha! experience is much more satisfying when it is preceded by the Huh? experience.” By creating a mystery, the writer-astronomer made dust interesting. He sustained attention, not just for the span of a punch line but for the span of a twenty-page article dense with information on scientific theories and experimentation. "

― Chip Heath , Made to Stick: Why Some Ideas Survive and Others Die