After helping a friend start a Spanish Club, I became addicted to Duolingo, the free language app. Then I discovered the power of free, artificially intelligent assistants.
Duolingo shares have jumped this week, as the number of Americans learning Mandarin on the app has soared 216%. That's as ...
The company confirmed to CNBC that there's been a 216% increase in Mandarin learners using the app compared to a year earlier ...
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