Addiction to a Language-Learning App Can Be Good for You
An employee works on a laptop inside an office (Photographer: Akos Stiller/Bloomberg)  

Addiction to a Language-Learning App Can Be Good for You

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(Bloomberg Businessweek) -- ReCaptcha inventor Luis von Ahn introduced Duolingo in 2012, hoping to help users master a new language. In minutes a day, the app promised, you could learn English, Spa...
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