The world is a very puzzling place. If you're not willing to be puzzled, you just become a replica of someone else's mind.

There is a noticeable general difference between the sciences and mathematics on the one hand, and the humanities and social sciences on the other. It's a first approximation, but one that is real. In the former, the factors of integrity tend to dominate more over the factors of ideology. It's not that scientists are more honest people. It's just that nature is a harsh taskmaster. You can lie or distort the story of the French Revolution as long as you like, and nothing will happen. Propose a false theory in chemistry, and it'll be refuted tomorrow.

Optimism is a strategy for making a better future. Because unless you believe that the future can be better, it’s unlikely you will step up and take responsibility for making it so. If you assume that there’s no hope, you guarantee that there will be no hope. If you assume that there is an instinct for freedom, there are opportunities to change things, there’s a chance you may contribute to making a better world. The choice is yours.

Whenever there is injustice, oppression, aggression, violence, it's standard for it to be supported by those we now call "intellectuals," but typically not by all; there is typically a fringe of dissidents. With very rare exceptions - in fact, it's hard to think of any - they suffer in one or another way; how depends on the nature of the society.

Should a community... be free to enact legislation to say they don't want blacks? Now that's illegal. Fifty years ago it was legal. Is that progress or is that regress?

In fact, the Outer Space Treaty of 1967 bans militarization. Potential adversaries of the US, and even its allies, are so far behind that these countries are very interested in maintaining the treaty. Europe and the rest of the world want a strong reaffirmation of the Treaty and the US is unilaterally trying to derail it. Termination of the treaty would mean that the US could develop satellite weapons, put offensive weapons in space. It would probably mean using nuclear power in space. All of this leads to some very dangerous scenarios, including destruction of the species.

The number of people killed by the sanctions in Iraq is greater than the total number of people killed by all weapons of mass destruction in all of history.