We are so isolated in our own little worlds, in our own little geographies, that it's pretty hard to understand where someone else is coming from. And so I think that we have to really think about what that means as a country and, frankly, whether this segregation that we have is durable over the long run.

As a culture, working-class white Americans like myself had no heroes. We loved the military but had no George S. Patton figure in the modern army. I doubt my neighbours could even name a high-ranking military officer.

We need to think about how we teach working-class children about not just hard skills, like reading and mathematics, but also soft skills, like conflict resolution and financial management.

People in my hometown voted for President Reagan - for many, like my grandpa, he was their first Republican - because he promised that tax cuts would bring higher wages and new jobs. It seemed he was right, so we voted for the next Republican promising tax cuts and job creation, George W. Bush. He wasn't right.

Children are already accustomed to a world that moves faster and is more exciting than anything a teacher in front of a classroom can do.

India, with one of the largest education systems in the world, has always been a priority for Khan Academy.

Me going out 25 minutes early onto the training ground to practise wasn't me being teacher's pet. That is what I have done throughout my career.

I'm sure all of us can find fault in our own education, and I certainly wished at times that I'd had other options. My own K-12 education may have been free and easy, but it wasn't necessarily very good.