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I build systems that combine humans and computers to solve large-scale problems that neither can solve alone. I call this Human Computation, but others sometimes call it Crowdsourcing. Some of my past projects include: CAPTCHA, The ESP Game (acquired by Google), GWAP, and reCAPTCHA (acquired by Google).
I'm currently working on Duolingo.
Duolingo: Translating the Web with Millions of People
as author at 26th AAAI Conference on Artificial Intelligence, Toronto 2012,
as author at 21st Conference on Innovative Applications of Artificial Intelligence,
as author at External contributions,