500 Days of Duolingo: What You Can (and Can’t) Learn From a Language App May 4, 2019 at 05:30AM

500 Days of Duolingo: What You Can (and Can’t) Learn From a Language App May 4, 2019 at 05:30AM


By ERIC RAVENSCRAFT from NYT Smarter Living https://nyti.ms/2vAKCjT
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