Three years ago, several of us at stan-ford launched the first massive open online courses, or MOOCs. We wanted to make the teaching of the world's great universities accessible to anyone with an Internet connection. The company we founded, Coursera, recently passed a milestone: 10 million enrolled learners. That makes it a good time to reflect on what we've learned. One early prediction about MOOCs was that they would undermine or even replace the traditional college education-an idea we at Coursera never endorsed (see "What Are MOOCs Good For?" page 68).
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