Human suffering has been caused because too many of us cannot grasp that words are only tools for our use.The mere presence in the dictionary of a word like 'living' does not mean it necessarily has to refer to something definite in the real world.

The truth is more magical - in the best and most exciting sense of the word - than any myth or made-up mystery or miracle. Science has its own magic: the magic of reality.

Many of us saw religion as harmless nonsense. Beliefs might lack all supporting evidence but, we thought, if people needed a crutch for consolation, where's the harm? September 11th changed all that.

Science is the poetry of reality.

Science replaces private prejudice with public, verifiable evidence.

Even those who do not, or cannot, avail themselves of a scientific education, choose to benefit from the technology that is made possible by the scientific education of others.

So it is best to keep an open mind and be agnostic. At first sight that seems an unassailable position, at least in the weak sense of Pascal's wager. But on second thoughts it seems a cop-out, because the same could be said of Father Christmas and tooth fairies. There may be fairies at the bottom of the garden. There is no evidence for it, but you can't prove that there aren't any, so shouldn't we be agnostic with respect to fairies?

If you don't understand how somethingworks, never mind: just give up and say God did it. You don'tknow how the nerve impulse works? Good! You don't understandhow memories are laid down in the brain? Excellent! Is photosynthesisa bafflingly complex process? Wonderful! Please don't goto work on the problem, just give up, and appeal to God.

In very different ways, the possibility that the universe is teeming with life, and the opposite possibility that we are totally alone, are equally exciting. Either way, the urge to know more about the universe seems to me irresistible, and I cannot imagine that anybody of truly poetic sensibility could disagree.