IN: 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."

Does this design help when there is a fire in a building?

OUT: systems. They not only make the buildings structurally stronger

IN: Van Halen is an American hard rock band formed in Pasadena, California, in 1972. From 1974 until 1985, the band consisted of guitarist Eddie Van Halen, vocalist David Lee Roth, drummer Alex Van Halen, and bassist Michael Anthony. The band went on to become major stars, and by the early 1980s they were one of the most successful rock acts of the time. 1984 was their most successful album.

Van Halen's next lead singer was Gary Cherone, frontman of the then-defunct Boston-based band Extreme, a group which had enjoyed some popular success in the early 1990s. The result was the album Van Halen III. Many songs were longer and more experimental than Van Halen's earlier work. It was a notable contrast from their previous material, with more focus on ballads than traditional rock songs ("How Many Say I," with Eddie on vocals). Sales were poor by the band's standards, only reaching Gold certification, despite the album peaking at No. 4 on the U.S. charts. However, Van Halen III did produce the hit "Without You," and another album track, "Fire in the Hole," appeared on the Lethal Weapon 4 soundtrack. The album was followed by a tour. The III Tour saw Van Halen playing in new countries, including first ever visits to Australia and New Zealand. Shortly afterwards, Van Halen returned to the studio and in early 1999, they started work on a new album. Working titles of songs included "Left for Dead," "River Wide," "Say Uncle," "You Wear it Well," "More Than Yesterday," "I Don't Miss You ... Much," "Love Divine," and "From Here, Where Do We Go?". The project was left unfinished when Cherone left the band amicably in November 1999. Citing musical differences, it is likely III's poor sales and critical reception had a big impact. None of the material from these sessions has ever been released, and in fact the band released no new material at all until three new songs were included on the 2004 Best of Both Worlds compilation. Lyrics that Cherone had written for the Van Halen III follow up would be used in his next project with Tribe of Judah. Touring with Cherone had proven disappointing in terms of attendance. Eddie would later admit that "the powers that be" (Warner Bros.) had forced his hand in parting with Cherone. Unlike with the previous two singers, there was reportedly no bad blood behind the breakup, and Cherone remained in contact and on good terms with Van Halen. As when Hagar left, speculation resumed on a Roth reunion.

Did they ever do a live perforamce?

OUT:
The album was followed by a tour. The III Tour saw Van Halen playing in new countries, including first ever visits to Australia and New Zealand.