www.ted.com/talks/luis_von_ahn_massive_scale_online_collaboration.html
If you use the web, you’re almost certainly part of a global team that’s digitizing the world’s books, one word at a time. How are you helping digitize one hundred million words each day? In this entertaining, mind-expanding TED talk, Luis von Ahn explains how a group of researchers created reCAPTCHA and turned one of the web’s big time-wasters into a crowdsourcing project involving ten percent of the world’s population. He also describes an emerging project to apply the same visionary approach to language translation.