After
re-purposing CAPTCHA so each human-typed response helps digitize books, Luis
von Ahn wondered how else to use small contributions by many on the Internet
for greater good. In this talk, he shares how his ambitious new project,
Duolingo, will help millions learn a new language while translating the Web
quickly and accurately — all for free.
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Recaptcha
saw a small problem (wasting only 10 seconds) and turned it into something
that benefits the world. What did they decide to do?
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