People do care where their food, or other goods, comes from, not merely if the price is right. And that means no business can afford to ignore the impacts their buying practices have on producers and on the perceptions and choices of consumers.

No genuine choice is ever simply a matter of the arbitrary exercise of will. Take your choice of lunch today. You can't decide to want anything, but what you want will at least in part be a result of a series of other choices and judgments you've made in your life to date.

If we find it hard to believe that winning millions might not be so lucky after all, we just don't have a good enough imagination. If I fantasise about winning the lottery, it doesn't take long before all sorts of worrisome potential consequences occur to me.

I think that a lot of social movements, political movements, powerful ones - certainly they form, collectively, an idea of the truth which becomes hard to question. It becomes a dogma, and from the inside it starts to look like common sense.

You should protest about the views of people you disagree with over major moral issues, and argue them down, but you should not try to silence them, however repugnant you find them. That is the bitter pill free speech requires us to swallow.

To become a stoic is to endorse the truthfulness of its world view and accept its prescription for how you ought to live, not just to like how it makes you feel.

Trying to keep up with health advice can feel like surfing the Net for weather forecasts: what you find is always changing, often contradictory and rarely encouraging.