This sounds strange to many people, but I work out for exactly 16 minutes every day, and do so at maximum speed by running 2.5 miles. This keeps me healthy without taking up too much time so I can stay focused on other things. It's one of the most efficient things I do each day.

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.

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.

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).

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

People are good at figuring out what's attractive, and computers are good at quickly searching and finding. You put them together, and bang!

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