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Science 23 November 2001:
Vol. 294. no. 5547, pp. 1646 - 1647
DOI: 10.1126/science.294.5547.1646
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News Focus

WORLD TRADE CENTER:
After the Fall

Robert Koenig

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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)