How language app Duolingo ranked number 28 on CNBC Disruptor 50 list
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How language app Duolingo ranked number 28 on CNBC Disruptor 50 list

Luis von Ahn, Duolingo CEO and co-founder, joins 'The Exchange' to discuss how the company is disrupting traditional lanuage learning.
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Fri, May 17 20192:04 PM EDT