Narratives are inherently more engrossing than basic facts. They have a beginning, middle, and end. If people get sucked in early, they’ll stay for the conclusion.
When you hear people tell a good story you hang on every word. You want to find out whether they missed the plane or what they did with a house full of screaming nine year olds. You started down a path and you want to know how it ends. Until it does, they’ve captured your attention.
No wonder that stories provide a quick and easy way for people to acquire lots of knowledge in a vivid and engaging fashion.