Duolingo transformed our phones into language-learning devices. Now, with Duolingo ABC, the company is tackling a fresh challenge: childhood literacy. The new app is like an interactive Sesame Street segment that teaches kids the basics of reading with fun and simple lessons. “By taking everything we know about how people learn—and especially what we know about how to keep learners motivated with ­gamification—we believe we can help make a dent in global illiteracy rates,” says Laura Shih, the company’s senior product manager. Matthew Gault

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