Osama bin Laden's death has prompted many people to look back on the attacks of Sept. 11, including Harvard Business School professor and historian, Nancy Koehn, who offers this commentary. This is clearly a big story — it has grabbed the attention and energies of the nation. So far, most of the media coverage has focused on the facts of bin Laden's assassination, the burial at sea and the consequences of his death for al Qaida and international security.

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