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A skyscraper is a continuously habitable high-rise building that has over 40 or 50 floors and is taller than approximately 100 m. They may contain offices, commercial and residential uses. Since they are each time higher, the term "supertall" is used for heights above 300 m and "megatall" for over 600 m.

Modern skyscrapers are built with steel or reinforced concrete frameworks and curtain walls of glass or polished stone. They must support their weight, resist wind and earthquakes, and protect occupants from fire.

The first skyscraper built is the Philadelphia City Hall in 1894 with 156 m. The first supertall skyscraper is the Empire State Building built in 1931 with 381 m, and the first megatall building is the Burj Khalifa in 2010 with 828 m. Between the first 50 countries with the most skyscrapers are China with 29, United Arab Emirates with 6 and Malaysia with 5.

The three tallest buildings in the world are the Burj Khalifa in Dubai, the Shanghai Tower in China, and the Abraj Al-Bait Clock Tower in Saudi-Arabia, all with more than 600 m. It is predicted that in 2020, however, they will be overtaken by the Jeddah Tower in Saudi-Arabia with an estimated completed height of 1008 m.
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