Skyscrapers & Buildings Skyscraper FactsTallest Building TimelineWorld’s Tallest BuildingsWorld’s Tallest Towers Removing the Obstacles Two developments in the 19th century paved the way for a whole new type of building: the skyscraper. The first was the development of a safe elevator. Primitive elevators of various designs had been used for centuries, and starting in the mid 19th century, steam-operated elevators were used to move materials in factories, mines, and warehouses. But these elevators were not considered safe for people; if the cable broke, they would plummet to the bottom of the elevator shaft....

Here, There and Everywhere The lasting impact of the Beatles’ sound has been heard in a wide variety of musical artists throughout the years. Florence and the Machine used an echo vocal effect made popular by John Lennon on their song “Breaking Down” from the album Ceremonials (2011). Celebrated indie rock musician Shannon Wright used Beatles-inspired effects both vocally and musically on “Everybody’s Got Their Own Part to Play” from her 2007 album Let in the Light....

Related Links Wombat Video Wombat Video Quiz Wombat Glossary Wombat Activity Wombats are native to savanna forests and grasslands. They are solitary, nocturnal animals that feed chiefly on grass, roots, and bark and have been known to gnaw down large trees. They are powerful burrowers, digging tunnels by lying on their sides and pushing out soil with their feet. Their burrows, which may be 100 ft (31.5 m) long, terminate in grassy nests....

Your goal in solving an analogy is to find a word that correctly completes the second pair. At first glance the words in an analogy may seem to have nothing to do with each other, but the words are always logically related. Both pairs of words have the same kind of relationship. To solve the analogy you need to find that relationship. Read the analogy like this: Ask yourself: What is the relationship between graceful and clumsy?...

Rockefeller Brainchild The World Trade Center was conceived in the early 1960s by the Downtown-Lower Manhattan Development Association to revitalize the seedy “Radio Row,” dominated by electronic stores. Chase Manhattan Bank chairman David Rockefeller, founder of the development association, and his brother, New York governor Nelson Rockefeller, pushed hard for the project, insisting it would benefit the entire city. In 1962, the Port Authority of New York and New Jersey began plans to build the center....

Team: 1. South Korea (Jang Yong-Ho, Kim Chung-Tae and Oh Kyo-Moon) def. 2. Italy (255-247); 3. United States def. Russia (239-239; tiebreak 29-26). WOMEN Individual: 1. Yun Mi-Jin, S. Kor def. 2. Kim Nam-Soon, S. Kor (107-106); 3. Kim Soo-Nyung, S. Kor def. Choe Ok Sil N. Kor (103-101). Team: 1. South Korea (Kim Nam-Soon, Kim Soo-Nyung and Yun Mi-Jin) def. 2. Ukraine (251-239); 3. Germany def. Turkey (240-234).

2006 Award Winners

Second Place: $75,000 scholarship, John Pardon, 17, Chapel Hill, N.C., for a project that showed a finite-length closed curve in the plane can be made convex in a continuous manner, and without bringing any two points of the curve closer together. Third Place: $50,000 scholarship, Dmitry Vaintrob, 18, Eugene, Oregon, for a project that proved loop homology and Hochschild cohomology coincide for an important class of spaces. Fourth Place: $25,000 scholarship, Catherine Schlingheyde, 17, Oyster Bay, N....

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