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Fazlur Rahman Khan (Bengali: phjlur rhmaan khaan, Fozlur Rohman Khan) (3 April 1929 - 27 March 1982) was a Bangladeshi-American structural engineer and architect, who initiated important structural systems for skyscrapers. Considered the "father of tubular designs" for high-rises, Khan was also a pioneer in computer-aided design (CAD). He was the designer of the Sears Tower, since renamed Willis Tower, the tallest building in the world from 1973 until 1998, and the 100-story John Hancock Center. Khan, more than any other individual, ushered in a renaissance in skyscraper construction during the second half of the 20th century.
Khan's central innovation in skyscraper design and construction was the idea of the "tube" structural system for tall buildings, including the framed tube, trussed tube, and bundled tube variants. His "tube concept", using all the exterior wall perimeter structure of a building to simulate a thin-walled tube, revolutionized tall building design. Most buildings over 40 stories constructed since the 1960s now use a tube design derived from Khan's structural engineering principles.  Lateral loads (horizontal forces) such as wind forces, seismic forces, etc., begin to dominate the structural system and take on increasing importance in the overall building system as the building height increases. Wind forces become very substantial, and forces caused by earthquakes, etc. are important as well. The tubular designs resist such forces for tall buildings. Tube structures are stiff and have significant advantages over other framing systems. They not only make the buildings structurally stronger and more efficient, but also significantly reduce the structural material requirements. The reduction of material makes the buildings economically more efficient and reduces environmental impact. The tubular designs enable buildings to reach even greater heights. Tubular systems allow greater interior space and further enable buildings to take on various shapes, offering added freedom to architects. These new designs opened an economic door for contractors, engineers, architects, and investors, providing vast amounts of real estate space on minimal plots of land. Khan was among a group of engineers who encouraged a rebirth in skyscraper construction after a hiatus of over thirty years.  The tubular systems have yet to reach their limit when it comes to height. Another important feature of the tubular systems is that buildings can be constructed using steel or reinforced concrete, or a composite of the two, to reach greater heights. Khan pioneered the use of lightweight concrete for high-rise buildings, at a time when reinforced concrete was used for mostly low-rise construction of only a few stories in height. Most of Khan's designs were conceived considering pre-fabrication and repetition of components so projects could be quickly built with minimal errors.  The population explosion, starting with the baby boom of the 1950s, created widespread concern about the amount of available living space, which Khan solved by building upward. More than any other 20th-century engineer, Fazlur Rahman Khan made it possible for people to live and work in "cities in the sky." Mark Sarkisian (Director of Structural and Seismic Engineering at Skidmore, Owings & Merrill) said, "Khan was a visionary who transformed skyscrapers into sky cities while staying firmly grounded in the fundamentals of engineering."

Are there any other interesting facts about this article?

His "tube concept", using all the exterior wall perimeter structure of a building to simulate a thin-walled tube,



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Dorothy Dandridge was born on November 9, 1922 in Cleveland, Ohio, to aspiring entertainer Ruby Dandridge (nee Butler) (March 3, 1900 - October 17, 1987) and Cyril Dandridge (October 25, 1895 - July 9, 1989), a cabinetmaker and Baptist minister, who had separated just before her birth. Ruby created a song-and-dance act for her two young daughters, Vivian and Dorothy, under the name The Wonder Children, that was managed by Geneva Williams. The sisters toured the Southern United States almost nonstop for five years (rarely attending school), while Ruby worked and performed in Cleveland.
Dandridge married dancer and entertainer Harold Nicholas on September 6, 1942, and gave birth to her only child, Harolyn Suzanne Nicholas, on September 2, 1943. Unfortunately, Harolyn was born brain-damaged and required constant care. By 1948, their marriage had deteriorated and Nicholas abandoned his family. Due to his adultery and abandonment, the couple divorced in October 1951.  While filming Carmen Jones (1954), the director Otto Preminger began an affair with his film's star, Dandridge. It lasted four years, during which period he advised her on career matters, demanding she accept only starring roles, advice Dandridge later regretted accepting. She became pregnant by him in 1955, but was forced to have an abortion by the studio. She ended the affair when she realized that Preminger had no plans to leave his wife to marry her. Their affair was depicted in the HBO Films biopic, Introducing Dorothy Dandridge, in which Preminger was portrayed by Austrian actor Klaus Maria Brandauer.  Dandridge married Jack Denison on June 22, 1959. They divorced in 1962 amid financial setbacks and allegations of domestic violence. At this time, Dandridge discovered that the people who were handling her finances had swindled her out of $150,000 and that she was $139,000 in debt for back taxes. Forced to sell her Hollywood home and place her daughter in a state mental institution in Camarillo, California, Dandridge moved into a small apartment at 8495 Fountain Avenue in West Hollywood, California.  Dandridge became involved with the National Urban League and the National Association for the Advancement of Colored People. As a result of the racism she encountered in the industry, she developed an interest in activism.

What year was she born?
September 2, 1943.