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

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?

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

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 am always able to keep a laser focus on one thing at a time without getting distracted. It helps that I try to break everything I do into small, achievable tasks.

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.

Because education is such a broad area, I chose to focus on language learning.

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

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

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.

In the center of your being there is a fountain of music and that is your love.

The needs are too great, and there are too few of us. We have a duty, a responsibility to help others. It’s not all about fun. It’s not always easy.

Personally, I do not support the concept of suicide bombings. This is not part of our [syrian] culture. But whether you condemn them or not, suicide bombings are a reality.

A strong relationship is an honest relationship, and no honest relationship is all peaches and cream. Love is the key. Where love abides, anger is but a passing visitor.

Sun and moon and day and night and man and beast each with a splendor which man in all his vileness cannot set aside; each with an excellence!

A group of men in evening clothes looks like a flock of crows, and is just about as inspiring.

A woman I loved [Andi Parhamovich] was killed in Baghdad in January 2007 – al-Qaeda in Iraq took credit for it … The memorial service with me crying over an empty coffin.

So if you're a gang member and you would normally be killing somebody, why not kill a white person?

There's nothing to be ashamed of here. Everyone's been with Carlito's sister!