That's a central part of philosophy, of ethics. What do I owe to strangers? What do I owe to my family? What is it to live a good life? Those are questions which we face as individuals.

Sometimes we know the best thing to do, but fail to do it. New year's resolutions are often like that. We make resolutions because we know it would be better for us to lose weight, or get fit, or spend more time with our children. The problem is that a resolution is generally easier to break than it is to keep.

When diamonds' role in fuelling violent conflict in Africa gained worldwide attention, the diamond industry established the Kimberley process in order to keep ""blood diamonds"" out of international trade.

I'm not overly alarmist about it, but I do think there are some worrying signs, like the growing accumulation of wealth by a very small proportion of the population, plus elections in the US are much more dominated by money than anywhere else calling itself a democracy.

Science is like a flashlight in the hands of people living in a huge balloon. They can illuminate anything in the balloon, but cannot shine it outside the balloon to see where it is floating - or if it is floating at all.

For three hundred years we have had our focus on the individual. We have distinguished him from the objective world as the Middle Ages did not think of doing. We have given him the world and the universe as a playground for exploration and discovery.

Science is not a heartless pursuit of objective information. It is a creative human activity, its geniuses acting more as artists than as information processors.

Science is among the most profoundly human of our activities. Far from being subsumed by the dehumanising effects of technology, science, in fact, remains our last stand against it.