There's a lot to be said for learning something in multiple passes. A fifteen-minute overview video can give a vague notion of what happened when, and lay the g

There's a lot to be said for learning something in multiple passes. A fifteen-minute overview video can give a vague notion of what happened when, and lay the ground work for more detail later -- as well as, perhaps, piquing a student's interest. There aren't that many students who will voluntarily go read through a history book. There are considerably more who will watch a 15-minute history overview video, which may make them more likely to study more history later. So, watch a video, read a book, read a bunch of books. None of this stuff is mutually exclusive. Rather, I would say its complementary.