Luis von Ahn is the founder and CEO of the language app DuoLingo. His problem: How do you teach people to speak a language -- really speak it -- using only an iPhone app?

On the surface, DuoLingo looks warm and fuzzy. Underneath the hood, it's a serious tech company built on artificial intelligence. But the best machine learning in the world still isn't good enough to really teach people how to fluently speak in a new language. Luis is trying to change that.

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