Education at Hand: Luis von Ahn / Co-Founder & CEO of Duolingo
Luis von Ahn created the most used educational app, Duolingo. The app teaches 40+ languages on a smartphone to its 72 million monthly active users for free. He aims to make learning available to all.
Learning with the Duolingo App
Duolingo's "Duo," New York
Luis von Ahn and Barack Obama