Duolingo -- the next chapter in human computation | Luis von Ahn | TEDxCMU 2011

Luis von Ahn, the man who brought the world CAPTCHA and reCAPTCHA unveiled his newest and most innovative project to date: Duolingo. How can you translate the entire internet and do it for free? Duolingo will be a revolutionary product in which millions of internet users from around the world will work together to translate the internet and learn a new language at the same time. All for free.
Luis von Ahn is the A. Nico Habermann Professor of Computer Science at Carnegie Mellon University. He builds systems that combine humans and computers to solve large-scale problems that neither can solve alone.
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