Luis von Ahn: Massive-scale online collaboration

The video discusses the invention of CAPTCHA and its evolution into ReCAPTCHA, which not only verifies human users but also aids in digitizing books. It highlights the global impact of ReCAPTCHA, with millions contributing to digitizing human knowledge. The video introduces Duolingo, a platform that combines language learning with web translation, offering a fair business model for language education by allowing users to learn for free while translating real content.

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