when I am teaching, running courses, almost the first thing i say is,
There is two parts to the homework today, at various points I will be giving you some inaccurate information during the course, I would like you to produce evidence to support the correct information, for tomorrow/next week.
I will give you the second part at the end,
second part, as when a question i can't answer immediately comes up ,
I would like everyone to come up with a solution supported by evidence to the very interesting point John has just made, thanks John.
This way they have to listen to everything I say, take good notes, and process it, and research it, and they then supply me with updated information.
I always slip something in there that is wrong, but it is amazing what they come back with, and far they look into something when they are trying to find a wrong, it makes people think.