There's something deeply rooted in American culture. You can pretty much identify what it was. You take a look at the history. It was internal conquest. You had to defend yourself against what the Declaration of Independence, Thomas Jefferson, an enlightened figure, called the attacks of the "merciless Indian savages," whose known way of warfare was torture and destruction. Also you had a slave population, you had to protect yourself against them. You needed guns.

I have written occasionally on links between my scientific work and political thinking, but not much, because the links seem to me abstract and speculative.

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.

It's kind of interesting and sick that the intellectual culture called the 1960s, "time of troubles," a dangerous period in which a lot of harm was done to the society. And the reason is because we were civilized and that's dangerous. That increased the commitment to democracy, to rights and so on, and this left people much less obedient.

There had been a free and open election in Haiti in the early 1990s and president Jean-Bertrand Aristide won, a populist priest. A few months later came the expected military coup - a very vicious military junta took over, of which the United States was passively supportive. Not openly, of course, but Haitians started to flee from the terror and were sent back and on towards Guantanamo Bay. Of course, that is against International Law. But the United States pretended that they were "economic refugees."

It's not in doubt that tobacco is far more lethal than hard drugs.

If you're teaching today what you were teaching five years ago, either the field is dead or you are.