Which company built Burj Khalifa in Dubai?

In summer. The tower stands 320 meters (1,050 ft) tall, about the same height as an 81-­s­torey build­ing. Because of thermal ex­pan­sion, the height varies by 15 cm (5.9 in) due to tem­per­a­ture.

Chicago school. The dis­tin­guish­ing features of the Chicago School are the use of steel-frame build­ings with masonry cladding, large plate-­glass window areas and limiting the amount of exterior or­na­men­ta­tion. Many Chicago School sky­scrapers contain the three parts of a clas­si­cal column.

It was built quickly and under budget. The Empire State Building took only one year and 45 days to build, or 7 million man-hours. To this day, this is a record for a sky­scraper of its height. Due to reduced costs during the De­pres­sion, the final costs totaled only $24.7 million instead of the es­ti­mat­ed $43 million.

Di­ges­tive enzyme. Pepsi Cola, first in­tro­duced in 1898, was named after pepsin (enzyme) and kola (nuts). In 1931, the company entered bank­rupt­cy and changed hands. The new owners changed the recipe to resemble more Co­ca-­Co­la.