When you tell an Iowan a joke, you can see a kind of race going on between his brain and his expression.

Every twenty minutes on the Appalachian Trail, Katz and I walked farther than the average American walks in a week. For 93 percent of all trips outside the home, for whatever distance or whatever purpose, Americans now get in a car. On average the total walking of an American these days - that's walking of all types: from car to office, from office to car, around the supermarket and shopping malls - adds up to 1.4 miles a week, barely 350 yards a day.

I see litter as part of a long continuum of anti-social behaviour.

English grammar is so complex and confusing for the one very simple reason that its rules and terminology are based on Latin - a language with which it has precious little in common. In Latin, to take one example, it is not possible to split an infinitive. So in English, the early authorities decided, it should not be possible to split an infinitive either. But there is no reason why we shouldn't, any more than we should forsake instant coffee and air travel because they weren't available to the Romans.

Boston's freeway system is insane. It was clearly designed by a person who had spent his childhood crashing toy trains.

Roads get wider and busier and less friendly to pedestrians. And all of the development based around cars, like big sprawling shopping malls. Everything seems to be designed for the benefit of the automobile and not the benefit of the human being.

Look at a globe and what you are seeing really is a snapshot of the continents as they have been for just one-tenth of 1 per cent of the earths history.