You know those squiggly words that you have to type for password-protected forms? Luis von Ahn invented that system and sold it to Google. Now he's invented a new free mobile app for language learning called "Duolingo."
His partner Severin Hacker says, "Free education will really change the world."
They found an interesting way to make the app sustainable without selling ads. BuzzFeed and CNN pay for page translations that students work on as part of the language learning process.
Students get knowledge for free. BuzzFeed and CNN pay Duolingo for the translations they want. Everyone should be happy but, surprisingly, some people are not. Their complaints are the subject tomorrow.
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