Its been about 15 years since the events of September 11th. I remember the day very clearly still. Reflecting on how much has changed since that day in society and our built environment is staggering. While visiting NIST this summer I had the opportunity to do some of this reflection. Largely a lot of the structural work being done there is to aim to improve the safety of our buildings. Outside their new fire lab they have preserved steel pieces from that day in a memorial. If you want to read more about the structural and human behavioral analysis of the events from that day the journal Fire Technology has a really comprehensive issue from 2013 which is a very enlightening read.