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.

One fact we're particularly proud of is that there are more people learning languages on Duolingo in the US than there are people learning languages in the entire US public school system.

I am an early riser, and always wake up between 5 and 6am.

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

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.

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?

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.