There are plenty of things that are unknown, but are assumed reasonably to exist, even in the most basic sciences. Maybe 90 percent of the mass-energy in the universe is called "dark," because nobody knows what it is.

In the United States, the day when you pay your taxes is a day of mourning because this alien force - the government - is coming to rob you of your hard-earned money. That's the general attitude, and it's a tremendous victory for the opponents of democracy, and, of course, any privileged sector is going to hate democracy. You can see it in the healthcare debate.

Take, for example, there is a right-wing populist uprising. It's very common, even on the left, to just ridicule them, but that's not the right reaction. If you look at those people and listen to them on talk radio, these are people with real grievances.

[Antonio] Gramsci's words and actions explain their assessment, though I think we should refrain from using the term "model intellectual" for him or others.

Human language is nothing like the signalling systems of other animals.

A very large majority of the U.S. population is in favor of establishing diplomatic relations with Cuba and has been for a long time with some fluctuations. And even part of the business world is in favor of it, too. But the government won't allow it.

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.