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Luis von Ahn - Massive-scale online collaboration

Luis von Ahn - Massive-scale online collaboration

(16:40) Who'd have thought that with some brilliant lateral thinking, CAPTCHAs (the annoying security test that verifies you're human) can be simultaneously used to benefit humanity. Computer science professor and entrepreneur Luis von Ahn tells the story of reCAPTCHA and DuoLingo. From TEDTalks 2011.

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