Unlike everyone else I know, I wasn't sent home early that day. At the time, my office was at the hospital, and all hospital employees were required to be available during disasters. Throughout the morning, updates were posted on the clinical e-mail system. Thousands of casualties were expected, and local hospitals were told to prepare to receive less serious cases. Then fewer casualties were expected. And then none. Over the hours, those people slowly disappeared, our missing patients who never arrived. That is my most vivid memory of the day, that and the unnatural silence in the skies.