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Introducing: How I Built This with Guy Raz
Guy Raz interviews the world’s best-known entrepreneurs to learn how they built their iconic brands. In each episode, founders reveal deep, intimate moments of …
reCAPTCHA and Duolingo: Luis von Ahn
In 2000, Luis von Ahn was starting his PhD in computer science when he attended a talk and happened to learn about one of Yahoo's biggest problems: automated bo…





