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Topic: Tallest building

	skyscraper - Hutchinson encyclopedia article about skyscraper
		The centre of a city is characterized by high-rise buildings and a concentration of public transport.
		Building so tall that it appears to ‘scrape the sky’, developed 1868 in New York, USA, where land prices were high and the geology allowed such methods of construction.
		In Manhattan, New York, are the Empire State Building 1931 (102,381 m/1,250 ft high) storeys and, until their destruction by terrorist attack in 2001, the twin towers of the World Trade Center 1970–74 (415 m/1,361 ft), but these are surpassed by the Sears Tower in Chicago 1973 (443 m/1,454 ft).
	encyclopedia.farlex.com /skyscraper (877 words)

	World Trade Center - Wikipedia, the free encyclopedia
		The difference in height between the two towers was because of a Port Authority request to have two floors, the 43rd and the 67th, in 1 WTC raised, the lower of the taller floors being a cafeteria for PANY workers.
		The core supported the weight of the entire building and the outer shell containing 240 vertical steel columns called Vierendeel trusses around the outside of the building, which were bound to each other using ordinary steel trusses.
		The twin towers were also the first supertall buildings to use sky lobbies, spaces where commuters can switch from an express elevator that goes only to the sky lobbies to a local elevator that goes to each floor in a section.
	en.wikipedia.org /wiki/World_Trade_Center (3909 words)

	Height of the Tallest Building
		As more buildings are proposed to be construct, even fact books cannot keep track of which to name the tallest building.
		The famous CN tower is often stated as the tallest building in the world.
		In 1997, the Council on Tall Buildings and Urban Habitats decided on four factors in judging building height; the height to the structural top, to the highest floor, to the top of the roof, and finally the height to the top of an antenna.
	www.hypertextbook.com /facts/2002/RubyChoi.shtml (1157 words)

	Skyscraper History
		A new method of building was developed that used a grid of steel beams and columns that were strong enough to support any stresses or forces a building might experience, including both the weight of the floor and the building contents, as well as the force of wind or even, in some areas, earthquakes.
		And with this new building method, the skyscraper was born and the race for the tallest building began.
		The tallest building so far in the 21st century is Taipei 101, built in Taiwan in 2004, which tops out at 1,670 feet and 101 stories.
	www.factmonster.com /spot/skyscraper1.html (1259 words)

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