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Are we seeing a shift from text to video as a primary form of expression? Perhaps in pop culture this has already happened with television, movies, youtube, and the web-but what if it stretches into academia? In fact, we're already seeing this with math.

Thordarson thought Khan Academy would merely be a helpful supplement to her normal instruction. But it quickly become far more than that. She's now on her way to "flipping" the way her class works. This involves replacing some of her lectures with Khan's videos, which students can watch at home. Then, in class, they focus on working problem sets. The idea is to invert the normal rhythms of school, so that lectures are viewed on the kids' own time and homework is done at school. It sounds weird, Thordarson admits, but this flipping makes sense when you think about it. It's when they're doing homework that students are really grappling with a subject and are most likely to need someone to talk to. And now Thordarson can tell just when this grappling occurs: Khan Academy provides teachers with a dashboard application that lets her see the instant a student gets stuck.