Imagine yourself giving a talk. During the talk you want to use a metaphor related to how Copernicus revolutionized the way we understand the Universe. And now imagine your audience is formed by individuals like the one in this video.

(The question is: What gravitates around the Earth?)

Your audience is not stupid, but it might be different than you are. In fact, count on it being different. After all, would you say you are just like everyone else?

A story is effective only when it is rooted in what your audience knows and believes. Get to understand your audience as much as you can.