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von Ahn, PhD, (TW: @LuisvonAhn, duolingo.com) is a computer science professor at Carnegie Mellon University and the CEO of Duolingo, a free language learning platform with more than 100 million users.
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Timothy Ferriss (Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers)