Ten years later

I assume every American over a certain age remembers exactly where they were 10 years ago today. I generally prefer to think of where we are and where we’re headed, but given the significance of the 9/11 attacks, and the inevitability of reflection on an anniversary like this one, I thought it best to post an open thread.

What do you remember most about Sept. 11, 2001? Taking stock a decade later, do you agree with Paul Krugman’s assessment this morning that “the memory of 9/11 has been irrevocably poisoned”? How much do you believe we’ve progressed, or regressed, over the last 10 years?