On September 11, 2001, our country - for just a moment - stopped functioning. In the wake of the attacks on lower Manhattan, amid the smoke, fires, stench, and rubble, those who were left breathing staggered to their feet, emerged from the subway, or sank to their knees, depending on their proximity to the World Trade Center. Across the river in New Jersey, everybody watched in disbelief as the city seemed to cave in on itself. The rest of the country was glued to their TV sets in shock and horror. It was in those few seconds after the second tower fell that New York City was silent for the first time.