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It's great that you're contrasting Khan to ALEKS. I'm not drinking the Khan kool-aid; my kid just started using ALEKS in the last month and I agree it's terrific. It's really puzzled me why Khan is getting all this attention when ALEKS has been around so much longer (and seems to be better in many respects -- just lacking instructional video). It would actually be terrific to have some kind of integration between ALEKS and Khan -- to be able to see a video lecture on a particular topic would be quite useful for the student.

Because KA has had a much bigger impact, millions of people are using it.

You have the tail wagging the dog there.

KA had a much bigger impact when it was growing word of mouth, long before it got publicity.

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