Khan got famous for explaining concepts really well. There were plenty of online stuff covering it already. He just did a superior product.

Same with the app. It needs to be excellent, something Steve Jobs would be proud of, and it will make dent in the universe.

This is big, heady, stuff, and we'll kill the ed business with it. I like nothing better than to see government jobs disappear.

Why would it need to be an app at all? It has zero benefits over being a website and requires students to buy an expensive piece of hardware to access it.