He should know. His business card, from the Minneapolis training company Growthworks, is printed on both sides. On one side, his title is Senior Partner, and, on the other side, Chief Storyteller. If I wasn't telling stories, I'd be thrown out of the room. They say that our sense of smell is one of the most powerful memory triggers.
Stories do that too.
They create a context that helps you understand why a point matters . An overhead with a couple of formulas just can't do that. If they mean something to him, he adds them to his repertoire. If they're funny, they can help, and if they have emotional content, that helps too. Libraries and bookstores teem with aids for the story-deprived.