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

Together with my advisor, Manuel Blum, I co-invented CAPTCHAs, or computer-generated tests that humans are routinely able to pass but that computers have not mastered (they are the squiggly computer letters that are prevalent across the web).

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

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.

Every time you buy tickets on Ticketmaster, you help to digitize a book.

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.

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."