P.J. Denyer
Penultimate Amazing
I clicked - because of a recent career goal: I want to teach children how to argue effectively. Might as well, eh? So I was interested in topics.
Here's a suggestion for a topic, "Fringe theories that contradict science claim that they are legitimate because some scientific theories have overturned the then prevalent scientific consensus. Is this a legitimate argument?'
I don't know what age group you're looking at, but I think this could potentially be an interesting topic and draw in a lot of powerful skeptical tools such as understanding the difference between personal conviction and objective evidence, arguments from authority (whether, and when, they are or are not valid), how today's consensus was arrived at, how that differed in the past, etc, etc.