TED: Massive-scale online collaboration

TED logoAfter re-purposing CAPTCHA so each human-typed response helps digitize books, Luis von Ahn wondered how else to use small contributions by many on the Internet for greater good. At TEDxCMU, he shares how his ambitious new project, Duolingo, will help millions learn a new language while translating the Web quickly and accurately — all for free.

Luis von Ahn builds systems that combine humans and computers to solve large-scale problems that neither can solve alone. Full bio »

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