The current business model for language education is the student pays — in particular, the student pays Rosetta Stone $500. The problem with this business model is that 95 percent of the world’s population doesn’t have $500.

Because education is such a broad area, I chose to focus on language learning.

The question that motivates my research is, if we can put a man on the Moon with 100,000 [people], what can we do with 100 million?

I usually make to-do lists with timelines, and pen and paper does the trick for me.

It's hard to think of a time when I'm not working, but when that is the case, I like to travel and eat good food.

I finished reading High Output Management by Andrew Grove, which had such valuable insights for leaders that I've been forcing managers at Duolingo to read the book.

Before the Internet, coordinating more than 100,000 people, let alone paying them, was essentially impossible. But now with the Internet, I've just shown you a project where we've gotten 750 million people to help us digitize human knowledge.