The visionary starts with a clean sheet of paper, and re-imagines the world.

We all assume that if you're weak and poor, you're never going to win. In fact, the real world is full of examples where the exact opposite happens, where the weak win and the strong screw up.

There will be statues of Bill Gates across the Third World. There's a reasonable shot that - because of his money - we will cure malaria.

A lot of what is most beautiful about the world arises from struggle.

In cognitively demanding fields, there are no naturals. Nobody walks into an operating room straight out of a surgical rotation and does world-class neurosurgery.

Even a sheet of paper has two sides