
President Barack Obama pauses during a moment of silence in the Diplomatic Reception Room of the White House at 8:46AM, Sept. 11, 2010, in remembrance of the time that the first plane hit the World Trade Center in 2001. (Official White House Photo by Pete Souza)
Some facts about the World Trade Center (WTC), the 7-building complex that included the "twin towers" (a.k.a. the "twin trade towers") destroyed on "9/11," 2001, along with 47-story 7 WTC which collaped later in the day.
Acres of land for the entire complex: 16
New acres created in Manhattan by the WTC excavation: 23.5 (this became Battery Park City).
Elevator top speed in the twin towers: 27 feet per second
Stories in each of the twin towers: 110
Workers on the WTC at peak construction: 5,000
Tons of cooling capacity of refrigeration plant (largest in the world when constructed): 60,000
Windows in twin towers: 43,600
Cubic yards of concrete to build the WTC: 425,000
Square feet of office space: 12,000,000
Number of people on a typical 2011 weekday arrived at WTC by 8:45 a.m.: 16,000-19,000
Miles away from WTC seismic meters registered the towers' collapse on 9/11: 265
Number of planes in North American airspace the FAA orders at 9:40 a.m. to land at the nearest airport: 4,546
Population of Gander, Newfoundland, offering food, clothing, and housing to nearly 7,000 stranded passengers from diverted flights to their local airport on Sept. 11, 2001: 10,000
Number of survivors pulled from the wreckage: 18
Number of search helpers on site by the early morning of September 12, 2001: 5,000 (approx.)
Highest recorded temperature inside the burning pile of debris: 2,000 F
Value of gold and silver removed from a Bank of Nova Scotia vault under 4 WTC: $200,000,000 (2001 value)
Number fo small businesses destroyed, displaced, or forced to close after 9/11: almost 18,000, approx. 130,000 employees.
Truckloads of debris required: 110,000+
Debris tons removed from the "ground zero" site: 1,400,000