The dawn of the twenty-first century brought to us vividly the dangers inherent in our modern world. The terrorist attacks in the US on the 11th September, 2001, the Second Gulf War now raging in Iraq, and the rapid spread of Severe Accuse Respiratory Syndrome (SARS) from the first reported infections in Guangdong province in China to over a dozen countries across continents – all these illustrate the perils confronting us in a shrinking world.