reCAPTCHA with Luis von Ahn

30 November 2014
Presented by Chris Smith.

Luis von Ahn invented CAPTCHA - the system that uses a picture of a word to determine whether you are a human or a computer. But when von Ahn realised just how much time was being wasted by filling in CAPTCHAs, he wondered whether that man-power could be used for something good. Now the very same process is digitising millions of books, that are available for free, as von Ahn told Chris Smith.

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