Background: Williams was born in Nassau, The Bahamas, on November 12, 1874, to Frederick Williams Jr. and his wife Julia. At the age of 11, Bert permanently emigrated with his parents, moving to Florida. The family later moved to Riverside, California, where he graduated from Riverside High School. In 1893, while still a teenager, he joined different West Coast minstrel shows, including Martin and Selig's Mastodon Minstrels, where he first met his future professional partner, George Walker.
Context: Walker was in ill health by this point due to syphilis, which was then incurable. In January 1909 he suffered a stroke onstage while singing, and was forced to drop out of Bandanna Land the following month. The famous pair never performed in public again, and Walker died less than two years later. Walker had been the businessman and public spokesman for the duo. His absence left Williams professionally adrift.  After 16 years as half of a duo, Williams needed to reestablish himself as a solo act. In May 1909 he returned to Hammerstein's Victoria Theater and the high-class vaudeville circuit. His new act consisted of several songs, comic monologues in dialect, and a concluding dance. He received top billing and a high salary, but "the White Rats," an organization of vaudevillians opposed to encroachments from blacks and women, intimidated the theater managers into reducing Williams' billing. The brash Walker would have resisted such an insult to his star status, but the more reserved Williams did not protest. Allies were few; big-time vaudeville managers were fearful of attracting a disproportionate number of black audience members and thus allowed only one black act per bill. Due to his skin, Williams typically travelled, ate and lodged separately from the rest of his fellow performers, increasing his sense of isolation following the loss of Walker.  Williams next starred as Mr. Lode of Koal, a farce about a kidnapped king that was well received by critics as a star vehicle though not a fully realized storyline. Camille Forbes' Introducing Bert Williams collects several reviews with competing race-based agendas. Many of the white reviewers praised Williams' "apparent spontaneous," "unpremeditated" humor, as if he were a guileless simpleton in no control of his own performance. A Chicago critic wrote, "They are racial, those hands and feet," while a Boston reviewer felt that the show's flimsiness and lack of structure were actually attributes because "when we succumb to the surreptitious desire for the broad tang of "nigger" humor, we want no disturbing atom of intelligence busy-bodying about." Meanwhile, many black reviewers ignored the show's faults, praising Williams' continued persistence and prominence as much if not more than his actual performance; an Indianapolis reviewer thought the play was evidence that "we are nearing the day of better things." Despite the good if loaded notices, Mr. Lode of Koal played a secondary string of theaters and was a box office flop.  Following the show's abbreviated run, Williams returned to the vaudeville circuit, and "the White Rats" renewed their opposition to his featured status. The Victoria Theater responded by cutting Williams to secondary billing, but putting his name on the marquee in lettering twice as large as that of the nominal headliner. Newspapers took note of the disingenuous manner in which the White Rats' demands had been met, as well as the way in which many of those performers who were impeding his career would rush to the front of the theater whenever his turn to perform came up.
Question: How were his performances recieved?
Answer: "the White Rats," an organization of vaudevillians opposed to encroachments from blacks and women, intimidated the theater managers

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: Do they still use this system today?
Answer:
Most buildings over 40 stories constructed since the 1960s now use a tube design