Background: 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.
Context: 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."
Question: Is there any popular buildings that use this structural design?
Answer: Khan was a visionary who transformed skyscrapers into sky cities

Background: Exile, originally known as The Exiles, is an American band founded in Richmond, Kentucky, by J.P. Pennington. They started by playing local clubs which led to touring with Dick Clark's Caravan of Stars opening shows and providing backup for major rock artists of the period. Their name was shortened to Exile in 1973, consisting of guitarist Pennington, leader/lead singer Jimmy Stokley, Bernie Faulkner B3 sax acoustic guitar, Billy Luxon trumpet, keyboardist Buzz Cornelison, bassist Kenny Weir, and drummer Bobby Johns.
Context: The band changed musical styles throughout the late 1960s and early 1970s. They shortened their name to Exile in 1973 and released their eponymous debut album through Wooden Nickel Records that same year. Singles released from the album proved unsuccessful, and it would be a good five years before the band released a full-length follow-up album.  In 1977, the band released the single "Try it On" on Atco Records, and it became a minor hit. The following year, Mike Chapman, an Australian who had established himself as a record producer in the UK, came to the United States in search of an experienced group who wrote their own material. Chapman heard an Exile demo and went to their next concert. Chapman evidently enjoyed what he saw. He and Exile decided to collaborate and together they produced the Mixed Emotions album on Warner/Curb Records. The first single release from that album was Kiss You All Over. The single reached Billboard's Top 40 on 5 August 1978. It remained on the chart for seventeen weeks and was No. 1 for four weeks in September. It was a best-seller for six months.  Their follow up single, "You Thrill Me," also from the Mixed Emotions LP did not fare as well, although it did reach the Top 40 for one week on 3 February 1979. The band toured with Aerosmith, Heart, Dave Mason, Boston, Seals & Crofts and other hot pop acts of the late seventies throughout the United States, Europe and Africa.  All There Is, the group's second Warner Bros. Records album, recorded a year later with a distinct disco beat, yielded a foreign hit, "The Part Of Me That Needs You Most." This single did particularly well in Europe and South Africa. Don't Leave Me This Way, their third album, produced by Peter Coleman, yielded two more singles, "Take Me Down" and "Smooth Sailing." Once again, it did well in Europe and South Africa although their popularity in the United States waned.  Numerous personnel changes took place in 1979. Perhaps most significantly, Stokley would leave the group that year, forcing remaining members guitarist/vocalist J.P. Pennington, keyboardist Buzz Cornelison, keyboardist/vocalist Marlon Hargis, bassist/vocalist Sonny Lemaire and drummers Steve Goetzman and Gary Freeman to search for a new lead singer. A young singer, Les Taylor, accepted an invitation to join the group and shared lead vocal duties with Pennington. By the early 1980s, other lineup changes took place, including the exit of original member Buzz Cornelison, plus keyboardist Mark Gray, who co-wrote "The Closer You Get" and "Take Me Down", both of which became hits for the group Alabama, played a short stint from 1980 to 1982.
Question: Did it ever reach number one?
Answer:
It remained on the chart for seventeen weeks and was No. 1 for four weeks in September. It was a best-seller for six months.