From the wreckage of the World Trade Center emerge new details of the cause of the towers' collapse.
In a scrap yard across the Hudson River from the fallen twin towers, engineering professor Abolhassan Astaneh-Asl pores over the 1,500 tons of twisted, charred steel arriving here each day from the remains of the World Trade Center like an archaeologist, like a coroner... Astaneh-Asl -- who has had access to 40,000 tons of scrap -- said his findings confirm the widely held theory about the buildings' demise: that the impact of the planes did relatively little damage to the Towers. Rather, it was 1,000-plus-degree heat from the burning jet fuel that caused key outer beams to buckle, and floor after floor to fall."
Thanks to Abhijeet Chavan
FULL STORY: Tower Wreckage Reveals Clues
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