Some of us will see a mile-high skyscraper built during our lives, asserts Eric Chemi, head of research for Businessweek and Bloomberg TV. By using a logarithmic scale and height data of buildings around the world that will be completed by 2020 and be taller than 1,500 feet, Chemi contends that a 5,280-foot-tall building will be built in about 40 years.

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