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He has perhaps only one valid point and that is that human teachers are very useful and they cannot be replaced by educational software.

No, that point wasn't even remotely valid, either. At least, not outside K12 education. Higher-ed teachers aren't being replaced by software, but by video lectures and peer groups.

Anyone who can't learn (for instance) math with Khan Academy and Wolfram Alpha wasn't going to learn it anyway, with or without a teacher.

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