Final Report on the Collapse of the World Trade Center Towers" (PDF). National Institute of Standards and Technology (NIST). September 2005. Archived (PDF) from the original on November 8, 2009 . Retrieved August 26, 2010. EPA Response to September 11". Archived from the original on March 6, 2008 . Retrieved August 27, 2007. Liberty Street: Project Updates". Lower Manhattan Construction Command Center. March 25, 2011. Archived from the original on March 28, 2011 . Retrieved April 11, 2011. Quintiere, James (December 2004). "2004 Report to Congress of the National Construction Safety Team Advisory Committee" (PDF). NIST. p.8. Archived (PDF) from the original on June 29, 2011 . Retrieved July 13, 2017.

National Institute of Standards and Technology (2005). Final report on the collapse of the World Trade Center towers (PDF). p.74. Eagar, T. W.; Musso, C. (2001), "Why did the world trade center collapse? Science, engineering, and speculation" (PDF), JOM, 53 (12): 8, Bibcode: 2001JOM....53l...8E, doi: 10.1007/s11837-001-0003-1, S2CID 56119666, archived from the original (PDF) on May 10, 2012 , retrieved November 29, 2012

NIST NCSTAR 1A: Final Report on the Collapse of World Trade Center Building 7" (PDF). National Institute of Standards and Technology. November 2008. pp.44–46. Archived from the original on January 21, 2016 . Retrieved July 13, 2017. Main article: World Trade Center (1973–2001) View from the northeast of the collapsing South Tower. Bažant, Zdeněk P.; Yong Zhou (2001). "Why Did the World Trade Center Collapse? – Simple Analysis" (PDF). Journal of Engineering Mechanics. Archived (PDF) from the original on October 9, 2019 . Retrieved September 11, 2006. IAN HERBERT: At least Everton came clean - unlike secretive Man City... but the 10-point punishment displays a Premier League intent on making an example of a club, in a pre-emptive strike against independent regulation Leaving your beauty routine out in the cold? Three beauty experts on the skin, hair and nail tips they're giving their celebrity clients this winter

Shukman, David (September 1, 2011). "Toxic dust legacy of 9/11 plagues thousands of people". BBC News. Archived from the original on September 11, 2011 . Retrieved September 11, 2011.The early jumpers came from the crash zone where the plane entered the building — the offices of the insurance brokers Marsh & McLennan. The decision to be very careful in choosing the right actors for the role became even more important when several new challenges appeared during shooting the film. Getting the filming equipment to shoot at such a great height had already been a difficult task. The crew also had to withstand what Mann described as “hurricane-force winds” that threatened to tear apart the entire structure. Then there was the intense heat that brought out snakes and other animals in the desert. I had no idea it would give me the peace years later to know that,’ says his sister Gwendolyn. ‘If he had fallen from the 110th floor to the ground we wouldn’t have had that.’

Final Report of the National Commission (2004). Collapse of WTC1 (PDF). {{ cite book}}: CS1 maint: numeric names: authors list ( link) Ronald Hamburger; William Baker; Jonathan Barnett; Christopher Marrion; James Milke; Harold "Bud" Nelson. "2". World Trade Center Building Performance Study - Chapter 2: WTC 1 and WTC 2 (PDF). Archived (PDF) from the original on 29 June 2021. Former tenant of Fred West's horror house urges serial killer's incarcerated wife Rose, now 70, to 'come clean' about the couple's brutal murder spree and to tell authorities if there are more undiscovered victims Ten years on, more than 1,000 have yet to be identified from remains. They were vaporised in the inferno. Gross, John L.; McAllister, Therese P. (2005-12-01). "Structural Fire Response and Probable Collapse Sequence of the World Trade Center Towers. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-6)". NIST: 335–336.Newman, Michael (June 29, 2007). "NIST Status Update on World Trade Center 7 Investigation" (Press release). National Institute of Standards and Technology. Archived from the original on August 29, 2010 . Retrieved August 26, 2010. Evans, Heidi (September 8, 2013). "1,140 WTC 9/11 responders have cancer–and doctors say that number will grow". New York Daily News. Archived from the original on September 11, 2013 . Retrieved March 31, 2023. Plane Crashes into Empire State Building". A&E Television Networks, LLC. Archived from the original on January 5, 2020 . Retrieved March 6, 2020. The metal conducted the heat through the building at a terrifying speed and it reached the upper floors long before the flames did. NIST concluded that the aircraft impact sheared off a significant portion of the fireproofing, contributing to the buildings' collapse. In WTC 1 the impact stripped the insulation off 43 of 47 core columns on more than one floor as well as floor trusses over a space of 60,000sqft (5,600m 2). In WTC 2 the impact removed insulation from 39 of the 47 columns on multiple floors and from floor trusses spanning an area of 80,000sqft (7,400m 2). [32]

a b c Bažant, Zdeněk P.; Verdure, Mathieu (March 2007). "Mechanics of Progressive Collapse: Learning from World Trade Center and Building Demolitions" (PDF). Journal of Engineering Mechanics. 133 (3): 308–319. CiteSeerX 10.1.1.121.4166. doi: 10.1061/(ASCE)0733-9399(2007)133:3(308). Archived (PDF) from the original on March 2, 2008 . Retrieved March 6, 2020. Jumping is something you can choose to do,’ he says. ‘To be out of the smoke and the heat, to be out in the air, it must have felt like flying.’ She said “I’m scared”,’ he tells me quietly. ‘She wasn’t a person who got scared, and I said, “Honey, it’ll be all right, it’ll be all right, you’ll get down”.’ Updated Ground Zero Report Examines Failure of Government to Protect Citizens". Sierra Club. 2006. Archived from the original on June 11, 2010 . Retrieved September 4, 2011.

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FEMA suggested that fires in conjunction with damage resulting from the aircraft impacts were the key to the collapse of the towers. Thomas Eagar, Professor of Materials Engineering and Engineering Systems at MIT, described the fires as "the most misunderstood part of the WTC collapse". This is because the fires were originally said to have "melted" the floors and columns. [113] Jet fuel is essentially kerosene and would have served mainly to ignite very large, but not unusually hot, hydrocarbon fires. [114] As Eagar said, "The temperature of the fire at the WTC was not unusual, and it was most definitely not capable of melting steel." [115] This led Eagar, FEMA and others to focus on what appeared to be the weakest point of the structures, namely, the points at which the floors were attached to the building frame. [116] Since then, the hunt for the Falling Man has moved on to another of the restaurant’s staff, Jonathan Briley, a 43-year-old sound engineer. The reaction of his deeply religious family has highlighted the deep moral complexities that suicide — whatever the circumstances — poses in a country where so many believe it is a sin, unforgivable by God. First Long-term Study of WTC Workers Shows Widespread Health Problems 10 Years After Sept. 11". ScienceDaily. Archived from the original on March 30, 2018 . Retrieved March 9, 2018. Edgar, Dr. Thomas; NOVA (2002). "The Collapse: An Engineer's Perspective". Why the Towers Fell. WGBH Educational Foundation. Archived from the original on July 17, 2006 . Retrieved May 2, 2006. a b c d e McAllister, Therese; Sadak, Fahim; Gross, John; Averill, Jason; Gann, Richard (June 2008). Overview of the Structural Design of World Trade Center 1, 2, and 7 Buildings. National Institute of Standards and Technology. Archived from the original on July 3, 2020 . Retrieved March 6, 2020.