USER REVIEWS
reCAPTCHA is a hybrid mechanical turk and captcha that allows visitors who complete the captcha to assist in the digitization of books.
From http://recaptcha.net/learnmore.html:
reCAPTCHA improves the process of digitizing...
From http://recaptcha.net/learnmore.html:
reCAPTCHA improves the process of digitizing...
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