Game of Tongues: How Duolingo Built A $700 Million Business With Its Addictive Language-Learning App

Beg for your life in Spanish,” demands Duo, a plump green owl. The viral meme circulating on Twitter stars the mascot for Duolingo, the hugely popular language-learning app, downloaded by more than 300 million people worldwide. While the meme is a joke, the real app is plenty insistent. Slack off on your daily Spanish lesson […]