When Sale Khan started posting a few free instructional videos on YouTube 15 years ago,

I don't think anyone could have imagined what Khan Academy would become.

More than 115 million registered users spread across 190 countries in 46 different languages.

And it's gone way beyond videos.

Now there are over 70,000 practice problems, quizzes, and articles,

even state-of-the-art SAT prep.

All of it available completely free to students and parents.

Welcome to people I mostly admire with Steve Levitt.

I spend much of my time these days working through my center at the University of Chicago to try to change the world for the better.

And I can't tell you how much we've struggled and how little impact we've had relative to what I would have hoped for.

Sal Khan makes it look easy, but in reality it is incredibly hard.

So today, I have two goals.

First, I want to get inside the head of Sal Khan to understand what the special sauce is that has made him so incredibly successful in this area,

so I can do better myself.

Second, although he doesn't advertise it, I have the suspicion that Sal Khan's ambitions go far beyond Khan Academy.

I think he has an even bolder plan in mind,

a complete rethinking of how education works.

I also have radical ideas for the future of education,

and my pipe dream is that our visions might align

and there could be an opportunity for us to work together.

So let's see.

Selcon, what a treat it is to get to talk to you today.

...