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

Source: https://www.nytimes.com/2019/05/04/smarter-living/500-days-of-duolingo-what-you-can-and-cant-learn-from-a-language-app.html?partner=rss&emc=rss
May 04, 2019 at 12:00PM

Free language learning apps often promise the world — but don’t expect fluency from one. Here’s what to expect before you sign up.