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Luis Von Ahn

Luis Von Ahn

Founder, CEO, Duolingo

Luis Von Ahn's reCaptcha was acquired by Google. Users of Captchas--the security word puzzles that virtually every Web site requires you to retype in order to weed out bots from humans--now help identify words from Google Books' scanned texts. Duolingo helps people learn a language while translating online documents.

[Captchas] are not only annoying, but they kill 10 seconds of your time.