the first bit just covers how they went from captcha to recaptcha, and why, which most here already know. the second part uses those ideas to explain their new website - duolingo.com
posted by my15minutes 1 decade 2 years 5 months ago • 1,441 views • 16:40TED talks
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Updated: 6 years 10 months 4 weeks ago
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TED talks.
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