While Americans have an admirable tendency to focus on the positive, historians say it's critical to also remember tragedy.
In a surprising twist, al-Qaeda issued a statement ridiculing 9/11 conspiracy theories claiming U.S. involvement in the attacks.
Osama bin Laden has reportedly been killed, but his body is gone.
You don't need to see a photo of Osama bin Laden dead. A picture might have been worth a thousand words, but these days technology may trump a photograph.