500 Days of Duolingo: What You Can (and Can’t) Learn from a Language App

Article URL: https://www.nytimes.com/2019/05/04/smarter-living/500-days-of-duolingo-what-you-can-and-cant-learn-from-a-language-app.html

Comments URL: https://news.ycombinator.com/item?id=19825632

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