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October 9, 2013
Luis von Ahn, one of the pioneers of crowdsourcing and the man who brought the world CAPTCHA and reCAPTCHA, has now brought us Duolingo, a free language-learning website and crowdsourced text translation platform. It can be used on the Web, iOS and Android. Learning on Duolingo feels like playing a game because languages are split into bite-sized skills with fun learning challenges -- you lose a life when you get something wrong, and you earn points when you complete a lesson. Duolingo is totally free -- making language-learning available to everyone.