'I wonder whether it is useful to let men know the secrets of nature. I am one of those who, like Alfred Nobel, ask whether future discoveries will bring more good than harm to mankind.' These were the words of Pierre Curie at an official Stockholm speech on being awarded the Nobel Prize in Physics for his pioneering work with radioactivity. More than a century later, the news of the circumstances of death of the Russian spy Litvinenko on the evening of 23 November 2006, at University College Hospital, London, has received a lot of attention. d>
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