There's some research that suggests that videos that actually help people to learn aren't pleasant to watch. http://chronicle.com/article/Confuse-Students-to-Help-Them/148385/

"It seems that, if you just present the correct information, five things happen," he said. "One, students think they know it. Two, they don’t pay their utmost attention. Three, they don’t recognize that what was presented differs from what they were already thinking. Four, they don’t learn a thing. And five, perhaps most troublingly, they get more confident in the ideas they were thinking before."

If the student feels confused by the video they are more likely to actually update.

The kind of informational videos that are popular aren't useful for learning and vice versa.

I voted other. The reason I suggested nontextual formats is because I don't believe that rationality can be taught solely through text, even if I personally prefer to learn that way. I have multiple friends who do not learn well at all in such a manner, but I believe that both of them would learn much more effectively from a video; I suspect this extends out to others, for whom the text dump nature of this site might be intimidating.