Over the last ten years, education technology evangelists have made remarkable claims about how new technologies will transform educational systems. In 2009, Clay Christensen of the Harvard Business School predicted that half of all secondary school courses in the US would be online by 2019, and that they’d cost 1/3 of a traditional course and provide better outcomes. Sal Khan of Khan Academy proposed in a TED talk that he could use short videos to reinvent education.
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