Luis von Ahn Introduces Duolingo in 2011

TEDx Talks · Talk · 17 min · 2011 · YouTube title: Duolingo -- the next chapter in human computation | Luis von Ahn | TEDxCMU 2011

Why it's here

HN people recommend it as a look at how to get people to eagerly do useful collective work, and as the origin of Duolingo.

What it covers

Luis von Ahn, creator of CAPTCHA and reCAPTCHA, presents Duolingo at TEDxCMU 2011. The idea is to have millions of people translate the web for free while learning a language, an example of human computation.