Luis von Ahn, reCAPTCHA y DUOLINGO
In reCAPTCHA (acquired by Google), he crowdsourced the digitisation of books. In ESP Game he gamified tasks for humans that computers couldn’t do on their own, like picture recognition. And then his latest project, Duolingo, gamified language learning.
Launched in 2011, Duolingo has 170 million users and is described as the world’s most popular language-learning platform.
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