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To: Raymond Duray who wrote (64954)	6/13/2005 2:03:32 AM
From: maceng2	Read Replies (2) \| Respond to of 74559

Thanks for the tips. I can't find the relevant posts at the moment. It included a discussion of the B25 that flew into the Empire State building at the close of WW2. The fact is the energy consideration between the two events was on a different scale. The twin towers were not designed with consideration to impacts of large airliners flying into them at full speed. I was amazed they stood up to the initial impacts. I think the collapse of the towers is due to ordinary events as explained in this link. sciam.com I understand you have some 25 yrs background with building structures?