Student Input: What would you like to learn about 9/11?

As we approach the 10th anniversary of the 9/11 tragedy, one wonders what we can learn from it.   What can we gain from revisiting this horrific day?  Your teacher is unsure so he's tapping the brains of you, his students.  What do you think we can focus on that will allow us to learn from the event of 9/11?  Write a five sentence paragraph here expressing your thoughts on this topic. 
Before typing your response, put your name and period in parenthesis i.e. (Paul Del Priore, Period 1).