I worked on a number of projects that were used by millions of people and that also served as inspiration to what we now call "crowd-sourcing."

I worked on a number of projects that were used by millions of people and that also served as inspiration to what we now call "crowd-sourcing."

I watch a lot of TV. That's how I spend most of my time outside of work. If I had more time, I would fill it 100 percent with watching TV.

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

I co-founded Duolingo with the mission of bringing free language education to the world.

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

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?