...re-purposing CAPTCHA so each human-typed response helps digitize books...s new project, Duolingo, will help millions learn a new language while translating the Web quickly and accurately -- all for free.http://www.youtube.com/watch?v=-Ht4qiDRZE8
You could notice that now in capture you have 2 words, not 1. Actually, only one of these words is used for verification that you are human and another word is used for digitization of the book. You never know which one is for what.
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