Before the Internet, coordinating more than 100,000 people, let alone paying them, was essentially impossible. But now with the Internet, I've just shown you a project where we've gotten 750 million people to help us digitize human knowledge.

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!

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

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."

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?

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