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

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 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.

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

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

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?