The absence of Saddam is a huge weight off the Arab world.

We are already seeing a degree of instability in the world because Obama seems to have consciously wanted to step back. Donald Trump is going to be "Obama squared," a more extreme version of the same thing.

It's a very bad thing when people exterminate other people, and people persecute minorities.

Public action should seek to expand the set of opportunities of those who have the least voice and fewest resources and capabilities.

Every math curriculum in the world is based on the idea of hand-calculating, and most of what you're teaching is how to calculate. And I think the resistance to this is very variable.

The American people are pretty impressive in their ability to keep after something if they think it is doable.

I mean, we're going to probably debate the Iraq war for at least as long as I'm alive.