In 1940 Bell Telephone needed to explain why the rotary phone was better. We can learn from their pedagogy.
This is fun. Following a classic story arc, problem - solution - hero, The Bell System explains why you want a new tech. My favorite line from grandpa: "I was just wondering why they wanted to change something that still works alright." My favorite line from the teen granddaughter after grandpa reads from the paper that "they" are going to take out "our" phones and replace them with dial-phones: "Oh gramps, that's yummy. Did they say how soon?"
Video: The Dial Comes To Town