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> One way or another, someone will always need to be available to answer students' questions. Books, videos, and clever programs running in web browsers simply can't do that.

Can't we use a model similar to Stack Overflow for answering students' questions? Most questions are bound to repeat, so I don't think there would be so many questions for the experts to answer after a while.

I've been teaching people to code for 20 years. In virtually every course I've ever taught, at least one person comes up with a question that I've never heard before. If that person were limited to learning from a web site or a video, that's the point at which that person would get stuck. But because I can answer their question, they can continue quickly.

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