I like the discussions being on the same page as the video explanations. Otherwise, we'll have to go searching for the prompt rather than having it right at hand.
I took a somewhat different approach. Once I read through the basic concept and how selection criteria are provided, I just use the commute downtown now and then to write out a 2 page essay 1-2 a week to pass the time.
Can you do something so if we make a comment the page won't have to refresh? If the video is playing and I submit a comment it refreshes the page and I have to restart the video.