For nearly an hour, no one speaks a word of English in this first-grade math class. Not the teacher, Ying Ying Wu, who talks energetically in Mandarin’s songlike tones. Not the students — 6- and ...
For tens of millions of users, language learning apps like Duolingo have provided an opportunity to freshen up on French or try their hand at Mandarin. The now 13-year-old language platform, which ...
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