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Luis von Ahn:
Massive-scale online collaboration

TEDxCMU · 16:39 · Filmed Apr 2011
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After 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. In this talk, 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.

Computer scientist
Luis von Ahn builds systems that combine humans and computers to solve large-scale problems that neither can solve alone. Full bio
This talk was presented to a local audience at TEDxCMU, an independent event. TED editors featured it among our selections on the home page.

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