Luis von Ahn describes the model for the free language-learning platform, Duolingo. The idea, he says, goes back to his childhood, where he imagined a model for a gymnasium that sustained itself by reselling people-produced energy. Von A…
Source: link.brightcove.com
Great idea and great results! According to wikipedia it has 12,5 million users worldwide (and counting). Nice presentations. I like how he puts in words the idea that humans are better learning online than producing electricity!
See on Scoop.it – Learning and Teaching Online
Digital Media in Education 
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