“When the poet Paul Valery once asked Albert Einstein if he kept a notebook to record his ideas, Einstein looked at him with mild but genuine surprise. “Oh, that’s not necessary,” he replied . “It’s so seldom I have one.”

Finally, this being America, there is the constant possibility of murder.

It sometimes occurs to me that the British have more heritage than isgood for them.

I do find London exciting. Much as I hate to agree with that tedious old git Samuel Johnson, and despite the pompous imbecility of his famous remark about when a man is tired of London he is tired of life…I can’t dispute it.

There is more difference between a zebra and a horse, or between a dolphin and a porpoise, than there is between you and the furry creatures your distant ancestors left behind when they set out to take over the world.

In the countryside, litter doesn’t have a friend. It doesn’t have anybody who’s saying, ‘Wait a minute, this is really starting to get out of control.’

In France, a chemist named Pilatre de Rozier tested the flammability of hydrogen by gulping a mouthful and blowing across an open flame, proving at a stroke that hydrogen is indeed explosively combustible and that eyebrows are not necessarily a permanent feature of one’s face.

Anyone who has read my books will know that I don’t tend to use guides when I am travelling. It’s not a pride thing, but it is certainly a fact.

The best that can be said for Norwegian television is that it gives you the sensation of a coma without the worry and inconvenience.

Des Moines is a mecca of cosmopolitanism, a dynamic hub of wealth and education, where people wear three-piece suits and dark socks, often simultaneously.

Why is it, I wondered, that old people are always so self-centered and excitable? But I just smiled benignly and stood back, comforted by the thought that soon they would be dead.

Physics is really nothing more than a search for ultimate simplicity, but so far all we have is a kind of elegant messiness.

The one thing we have in common with all other living things is that for nearly four billions years our ancestors have managed to slip through a series of closing doors every time we needed them to.

Still, I never really mind bad service in a restaurant. It makes me feel better about not leaving a tip.

That’s the trouble with losing your mind; by the time it’s gone, it’s too late to get it back.

Australians are very unfair in this way. They spend half of any conversation insisting that the country’s dangers are vastly overrated and that there’s nothing to worry about.

Everywhere throughout New England you find old, tumbledown field walls, often in the middle of the deepest, most settled- looking woods- a reminder of just how swiftly nature reclaims the land in America.