If you understand something, then you explain it to an appropriate audience: you can teach them something. Their final assignment involves students sharing their moral reasoning skills with an audience of people not in our class. Students have to show this audience how to rationally evaluate moral arguments, using examples they provide, and then teach the audience some basic skills at doing this, involving arguments that the audience provides. I call this "philosophical community service."
Here is the assignment (more details and backstory asap):