Technology

Massive-scale online collaboration: Luis von Ahn on TED.com

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. 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. (Recorded at TEDxCMU, April 2011, in Pittsburgh, PA. Duration: 16:40)

Watch Luis von Ahn’s talk on TED.com, where you can download it, rate it, comment on it and find other talks and performances from our archive of 1,000+ TEDTalks.