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.

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?

[Captchas] are not only annoying, but they kill 10 seconds of your time.

My ultimate research goal is to transform our human existence to just eating, sleeping, drinking, playing - nevermind.

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.

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.

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