After the Fall

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Science  23 Nov 2001:
Vol. 294, Issue 5547, pp. 1646-1647
DOI: 10.1126/science.294.5547.1646

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NEW YORK CITY-- Researchers have found some, but not all, of the answers about why the twin towers of the World Trade Center collapsed--and why they stood for as long as they did. Did floor trusses or internal columns fail first? Meeting last week at a forum at Columbia University, engineers agreed that the impact of the hijacked planes themselves probably would not have brought down either building without the intense heat from the fires that followed.