Smash Notes
Who Invented Captcha
At some point, Luis found out that Yahoo had a problem with spammers who were abusing their systems and Yahoo had no way to stop them. Luis and his advisor invented Captcha to stop these spammers.
From Scratch with Jessica Harris
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Luis Von Ahn - Founder of Recaptcha and Duolingo
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at 2:30
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·Transcript
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