# Luis von Ahn: Massive-scale online collaboration

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.

- Kind: Talk
- Year: 2011
- Runtime: 16 min
- By: TED.com
- Genres: Education, Science
- Archive: [Internet Archive](https://archive.org/details/LuisVonAhn_2011X)
- Licence or status: [CC BY-NC-ND 3.0](http://creativecommons.org/licenses/by-nc-nd/3.0/) (as the archive states it)
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/LuisVonAhn_2011X?play=1)