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Sonata Arctica is a Finnish power metal band from the town of Kemi, Finland. Created as a hard rock band named Tricky Beans, they later changed to Tricky Means and finally to Sonata Arctica, when they shifted to power metal. The current line-up consists of singer, keyboardist and songwriter Tony Kakko, guitarist Elias Viljanen, bass guitarist Pasi Kauppinen, keyboardist and keytarist Henrik Klingenberg, and drummer Tommy Portimo. All the musicians of the band's history except Portimo also acted as backing vocalists.
On May 25, 2007, Unia was released. The album's first single, "Paid In Full", was released on April 27, 2007. On August 6, 2007, the band announced on their website that guitarist Jani Liimatainen had been asked to leave the band due to problems related to his conscription. He was replaced by Elias Viljanen who had already filled in for him in the band's Finnish and Japanese shows during the spring and summer. In October 2007 Sonata Arctica headlined the ProgPower USA VIII. Later the band supported Nightwish across their 2008 tour of United States and Canada and headlined at the shows that Nightwish cancelled due to Anette Olzon's sudden severe sickness. It was announced on September 4, 2008 that the band's first two albums would be re-released with bonus tracks by Spinefarm UK on October 6. The Days of Grays was released on September 16, 2009 in Finland and September 22 in the USA. Henrik stated that the new album would be in the same vein as Unia, but not as complex and darker. Singles from this album include "Flag in the Ground" and "The Last Amazing Grays". On August 28, 2009, the music video of "Flag In The Ground" was released to the web. The limited 2CD European edition of the album featured many of the album tracks with all instruments performed by a symphony orchestra. The band also toured with DragonForce for the third U.S. leg of the Ultra Beatdown. In early 2010 they engaged on an Australian tour with Ensiferum and Melbourne band Vanishing Point. In April 2010, Sonata Arctica embarked on their USA and Canada Headlining tour for The Days of Grays. In October they headlined in Chile in support of the same album.
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Is Unia the name of an album by Sonata Arctica?

Answer:
Unia was released.

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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."
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Are there any other interesting aspects about this article?

Answer:
Khan's central innovation in skyscraper design and construction was the idea of the "tube" structural system for tall buildings,