New York Times: Marco Bomio recalls that bright Sunday morning in June 2006 as if it were yesterday. Mr. Bomio, 59, a school principal and mountain guide, attended a religious service on a high mountain meadow to mark the founding of a local guide group. Suddenly we saw this immense cloud, he said over coffee in a wood chalet typical of this Alpine village. Normally, it might have been snow. But in June? Then we saw that it wasnt snow, he went on. It was rock dust: part of the mountain had come down....