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The purpose of the article is to underscore the difficulties and importance of post-disaster research investigation into why exactly the structural collapse of the towers happened. Dr. Knowles does this by looking into the cause, investigation, and aftermath of several historical building catastrophes in the US.   These cases have reveal how politics, public, and private entities contributed to the disasters and what tends to happen in the aftermath. In the case of the World Trade Center, Dr. Knowles identifies the main reasons for the structures failing and how other sky scrapers are susceptible to the same attack. 

1) Case studies.

2) The laws of France with regard to healthcare and non-citizens.

3)  Personal experience of medical professionals.