Henry Kissinger doesn’t believe in retirement. At 91, having had a heart-valve operation three months ago, he is nonetheless publishing a book entitled World Order. As I happened to be interviewing him about it on 11 September, I asked him about his memories of 13 years ago. ‘I was in Frankfurt addressing a business group,’ he recalled in that voice of his that sounds like gravel has found its way into your car’s exhaust pipe.