Luis von Ahn, the CEO of Duolingo, is originally from Guatemala. He became a billionaire at the young age of 30 after developing and selling CAPTCHA and reCAPTCHA—technologies designed to block fake accounts—to Google. However, the deep sense of inequality in education he experienced during his childhood left a lasting impression on him. Witnessing the reality in Guatemala, where ordinary people had to bear excessive costs to access quality education, he came to believe that “good education should be free and accessible to everyone.” With that vision, he founded Duolingo in 2011. #duolingo #luisvonahn #socialimpact