Before humans learned to write, and before the scientific method, stories and songs were the method that knowledge was passed on from generation to generation. Memorization was the storage medium, and since there was no controlled experimentation, that knowledge was always of the form "Once, X happened, and then Y happened."--in other words, a story.

Thus, humans evolved to hook into storytelling very readily--especially aural storytelling. This American Life is perhaps the best example of this medium.