Fundamentally not to waste energy. If we were all to reduce our demands for energy, it would make an enormous amount of difference.

It is vital that there is a narrator figure whom people believe. That's why I never do commercials. If I started saying that margarine was the same as motherhood, people would think I was a liar.

I don't approve of sunbathing, and it's bad for you.

In the West, that's what's happening. The birth rate has been dropping steadily and still is. But there is still a vast amount of the world where that's not the case. And that is where the big population growth is taking place.

Opponents say natural selection is not a theory supported by observation or experiment; that it is not based on fact; and that it cannot be proved. Well, no, you cannot prove the theory to people who won't believe in it any more than you can prove that the Battle of Hastings took place in 1066. However, we know the battle happened then, just as we know the course of evolution on earth unambiguously shows that Darwin was right.

I suppose happiness is something one enjoys, but I suspect that happiness is not a state but rather a transition.

The reverse side of the coin in having this extraordinary ability to go anywhere, is that no one anywhere is remote any more.