We need a kind of feminism that aims not just to assimilate into the institutions that men have created over the centuries, but to infiltrate and subvert them.

But the economic meltdown should have undone, once and for all, the idea of poverty as a personal shortcoming or dysfunctional state of mind. The lines at unemployment offices and churches offering free food includes strivers as well as slackers, habitual optimists as well as the chronically depressed. When and if the economy recovers we can never allow ourselves to forget how widespread our vulnerability is, how easy it is to spiral down toward destitution.

An asteroid could hit us at any moment. This is not - and also, the most successful kind of life on this planet is not us, it's microbes. They're the ones who greatly outnumber us, and may eventually destroy us.

When I was born, my father was a copper miner in Butte, Montana. It was a hard-core, blue-collar situation.

A free-enterprise economy depends only on markets, and according to the most advanced mathematical macroeconomic theory, markets depend only on moods: specifically, the mood of the men in the pinstripes, also known as the Boys on the Street. When the Boys are in a good mood, the market thrives; when they get scared or sullen, it is time for each one of us to look into the retail apple business.

So even though I consider myself a fairly upbeat person, energetic and things like that, I never do very well on happiness tests.

At issue is not only knowledge of the world but our survival as individuals and as a species. All the basic technologies ever invented by humans to feed and protect themselves depend on a relentless commitment to hard-nosed empiricism: you cannot assume that your arrowheads will pierce the hide of a bison or that your raft will float just because the omens are propitious and you have been given supernatural reassurance that they will. You have to be sure.