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Date: 2015-04-10 09:15:41Anti-spam Carnegie Mellon University Crowdsourcing ReCAPTCHA CAPTCHA Olympus Luis von Ahn Lenore Blum Technology Human-based computation World Wide Web Computing | Microsoft Word - Invitation3.docAdd to Reading ListSource URL: www.cmu.eduDownload Document from Source WebsiteFile Size: 2,24 MBShare Document on Facebook |