Austin Ligon
From Scratch with Jessica Harris
ReCAPTCHA and Duolingo: Luis von Ahn
How I Built This with Guy Raz
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 […]