Science talks about very simple things, and asks hard questions about them. As soon as things become too complex, science can't deal with them... But it's a complicated matter: Science studies what's at the edge of understanding, and what's at the edge of understanding is usually fairly simple. And it rarely reaches human affairs. Human affairs are way too complicated.

When geologists announced the beginning of a new geological epoch, the Anthropocene, humans destroying the environment, one of the main things they pointed to is the use of plastics in the earth.

Every great power, every aggressive power has always regarded itself as exceptional and as doing things only for the most moral ends.

Take like, say, Obama, he's called "liberal" and he's praised for his "principled objection to the Iraq war". What was his "principled objection"? He says it was a "strategic blunder," like Nazi generals after Stalingrad.

Physics and those parts of other fields that grow out of physics - chemistry, the structure of big molecules - in those domains, there is a lot of progress. In many other domains, there is very little progress in developing real scientific understanding.

The respected intellectuals are those who conform and serve power interests.

It's this kind of wild unpredictability, megalomania, thin-skinned craziness that really has me worried, more than [Donald Trump] statements. Now, on the climate change there's just nothing to say, he's perfectly straightforward.