Luis von Ahn - From Scratch with Jessica Harris

What this episode covers

Luis is an inventor and computer science professor at Carnegie Mellon. He is one of the creators of CAPTCHA, a system that allows websites to determine whether you’re a human or a computer. CAPTCHAs are wavy, distorted words that people need to type out when they’re submitting a form to a website. Luis’ company ReCAPTCHA proved users were humans while also digitizing books. The company was sold to Google in 2009. He also founded the language learning app Duolingo, attracting over 150 million users in its first four years. Luis won a Macarthur Genius Grant in 2006. Luis speaks with Jessica Harris about how he launched ReCaptcha and Duolingo, from scratch. Listen to the interview

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Frequently Asked Questions

How long is this episode of From Scratch with Jessica Harris?

This episode is 30 minutes long.

When was this From Scratch with Jessica Harris episode published?

This episode was published on May 15, 2026.

What is this episode about?

Luis is an inventor and computer science professor at Carnegie Mellon. He is one of the creators of CAPTCHA, a system that allows websites to determine whether you’re a human or a computer. CAPTCHAs are wavy, distorted words that people need to type...

Can I download this From Scratch with Jessica Harris episode?

Yes, you can download this episode by clicking the download button on the episode player, or subscribe to the podcast in your preferred podcast app for automatic downloads.