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Luis von Ahn, founder of reCAPTCHA and Duolingo, discusses the creation of CAPTCHA to combat spam, the evolution of Duolingo, and the power of crowdsourcing. The episode also explores his choice to decline an offer from Bill Gates and the challenges of monetization in the podcast industry.
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Quick takeaways
- CAPTCHA was initially developed to solve the problem of automated bot sign-ups and spam
- Duolingo found success by transitioning from advertising to a freemium subscription model
Deep dives
Building CAPTCHA and Duolingo
Luis Von Ahn, a professor at Carnegie Mellon University, created CAPTCHA, a tool that uses distorted characters to distinguish between humans and computers. He then developed the idea of using these distorted characters as a way to crowdsource the digitization of books. Collaborating with Ben Moore, they created a platform that offered free language learning while simultaneously translating texts using the wisdom of the crowd. This led to the launch of Duolingo, an app that quickly became the most downloaded education app of its time.
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