Tagged With ReCAPTCHA

The CEO who invented an online tool you see every day gave his tech to Yahoo for free — and he doesn't regret it


Bill Gates tried to poach the CEO of $700 million Duolingo, and they still keep in touch — here's what they talk about


How Duolingo's CEO went from being a 10-year-old video-game bootlegger to building a $700 million company



Google has killed off CAPTCHA as you know it