When do you teach the history of a subject?
If you leave the history until later in a course, students have no context on which to hang the facts: Why are you telling us all this stuff?
If you discuss the history early on, students have no context in which to place it: Why are you telling us all this stuff?
Over the years, I've tried it both ways, and been dissatisfied with both. I don't know the answer to this one. Do you?