One fact we're particularly proud of is that there are more people learning languages on Duolingo in the US than there are people learning languages in the entire US public school system.

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

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

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."

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.

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

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