“Talking to people about that day, I was struck by how ready and almost rehearsed they were for this event. A decade earlier, nothing approaching their level of collaboration and efficiency would have occurred. We have, as one colleague put it to me, replaced our pre-9/11 naïveté with post-9/11 sobriety. Where before we’d have been struck dumb with shock about such events, now we are almost calculating about them. When ball bearings and nails were found in the wounds of the victims, everyone understood the bombs had been packed with them as projectiles. At every hospital, clinicians considered the possibility of chemical or radiation contamination, a second wave of attacks, or a direct attack on a hospital. Even nonmedical friends e-mailed and texted me to warn people about secondary and tertiary explosive devices aimed at responders. Everyone’s imaginations have come to encompass these once unimaginable events.”
:: Why Boston’s Hospitals Were Ready by Atul Gawande : via Zoe ::
This is a fast read that also gave me a sense for what “180 injured” really means and just how horrifying it was. 
